feat(graph): pipeline graph improvements — on_failure, tooltips, bus-bar connectors, skipped colouring, HTML and Mermaid output

- when: on_failure visual distinction: red circle (#d9534f), X-mark icon, dashed
  chip border, and Mermaid classDef; legend entry added
- Job tooltip / detail panel: each chip wrapped in <g data-job="…"><title>…</title>
  <desc>…</desc> so SVG viewers and the HTML sidebar show stage, when, image, needs
- Multi-job connector accuracy: classic mode now uses a bus-bar pattern (vertical
  rail at midpoint + per-job stubs) instead of one center-to-center line per stage pair
- Blocked/skipped state colouring: RenderPipeline and pipelineSVG accept
  *cicontext.Context; skipped jobs rendered in grey (#868686) with dimmed text
- Interactive HTML output (--format html): self-contained .html with inline SVG,
  mouse-wheel zoom, drag-to-pan, double-click reset, and a click-to-open sidebar
- Mermaid pipeline output (--format mermaid): prints existing Pipeline() flowchart
  to stdout; suitable for mermaid.live or Markdown embedding
- imageString() helper to extract image name from string or map form
- 100% statement coverage maintained; 809 tests pass

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -5,6 +5,24 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 This project uses [Semantic Versioning](https://semver.org).
 
+## [0.2.25] - 2026-06-25
+
+### Added
+
+- **`when: on_failure` visual distinction** — SVG and HTML pipeline graphs now render failure-path jobs with a red status circle (`#d9534f`), an X-mark icon, and a dashed chip border. A new `on_failure` legend entry and Mermaid `classDef` entry are included.
+
+- **Job tooltip / detail panel** — every job chip in SVG and HTML output is wrapped in a `<g data-job="…"><title>…</title><desc>…</desc>` group. SVG viewers that support `<title>` show the job name on hover; `<desc>` carries `stage`, `when`, `image`, and `needs` details. In HTML output the sidebar reads these directly from the DOM.
+
+- **Multi-job connector accuracy** — classic mode (no `needs:`) now uses a bus-bar connector: horizontal stubs from every job in stage N to a vertical rail at the midpoint, then stubs from the rail to every job in stage N+1. The previous single center-to-center line left top and bottom jobs visually disconnected.
+
+- **Skipped / blocked state colouring** — `glint graph pipeline` now accepts the same context flags as `glint check` (`--branch`, `--tag`, `--source`, `--var`, `--changes`, `--changes-from`). Jobs that evaluate to `JobSkipped` in the given context are rendered with a grey circle (`#868686`) and dimmed job name. When no context flags are given, all jobs render with their normal colours.
+
+- **Interactive HTML output** (`--format html`) — `glint graph pipeline --format html` writes a self-contained `.html` file to `--out`. The page embeds the SVG inline with mouse-wheel zoom (centred on cursor), drag-to-pan, double-click-to-reset, and a collapsible sidebar showing job details on chip click. No external dependencies; works offline.
+
+- **Mermaid pipeline output** (`--format mermaid`) — `glint graph pipeline --format mermaid` prints the existing Mermaid flowchart (`pipeline.go`) to stdout. Suitable for pasting into [mermaid.live](https://mermaid.live) or embedding in Markdown documentation.
+
+- **`imageString` helper** — internal utility that extracts the image name from a `Job.Image` field that may be a plain string or a map (`image: {name: ..., entrypoint: ...}`); used by the tooltip desc builder.
+
 ## [0.2.24] - 2026-06-25
 
 ### Added

FEATURES.md

@@ -282,8 +282,29 @@ jobs or pipeline-level findings.
 | `pipeline` | GitLab CI-style SVG/PNG written to `--out` directory (default: `glint-out/`); converted to PNG when `rsvg-convert`, `inkscape`, or `magick` is available |
 | `all` | `includes` to stdout + `pipeline` file path to stderr |
 
+**`glint graph pipeline --format <FORMAT>`**
+
+| Format | Effect |
+|--------|--------|
+| `svg` (default) | Write GitLab CI-style SVG/PNG to `--out` |
+| `mermaid` | Print Mermaid flowchart to stdout (paste into [mermaid.live](https://mermaid.live)) |
+| `html` | Write self-contained HTML to `--out` with mouse pan/zoom and a click-to-open job-detail sidebar |
+
+**Visual distinctions in SVG and HTML output:**
+
+- **Regular** — blue circle with checkmark
+- **Manual** — orange circle with play triangle
+- **Trigger** — purple circle with chevron
+- **Delayed** — yellow circle with clock
+- **`when: on_failure`** — red circle (`#d9534f`) with X mark; dashed chip border
+- **Skipped** (with `--branch`/`--tag`/`--source` context flags) — grey circle, dimmed job name
+
 In DAG pipelines (any job has `needs:`) the pipeline graph uses job-to-job
-Bézier connectors instead of stage-to-stage lines.
+Bézier connectors. In classic mode a bus-bar pattern (vertical rail + per-job
+stubs) accurately connects every job across adjacent stages.
+
+Each chip carries a `<title>` and `<desc>` with stage, when, image, and needs —
+shown as a tooltip in SVG viewers and as a sidebar panel in HTML output.
 
 ---
 

README.md

@@ -6,7 +6,7 @@
 
 <p align="center">
   <a href="LICENSE"><img src="https://img.shields.io/badge/license-Apache%202.0-blue.svg" alt="License"></a>
-  <a href="CHANGELOG.md"><img src="https://img.shields.io/badge/release-v0.2.24-blue.svg" alt="Release"></a>
+  <a href="CHANGELOG.md"><img src="https://img.shields.io/badge/release-v0.2.25-blue.svg" alt="Release"></a>
 </p>
 
 > **Disclaimer:** This tool was built through iterative AI-assisted development with [Claude](https://claude.ai). It is experimental, incomplete, and not intended for production use. Coverage of GitLab CI keywords is best-effort and may lag behind GitLab's evolving spec. Use it at your own discretion — no correctness guarantees are made. Contributions and bug reports are welcome.
@@ -20,7 +20,7 @@ A local tool to validate and lint `.gitlab-ci.yml` pipelines without needing a G
 - **Simulates context** — `--branch`, `--tag`, `--source` flags evaluate `rules:if:` and `only`/`except` to show which jobs would be active, manual, or skipped; `--context branch=main --context branch=develop` prints a multi-column comparison table across multiple contexts in one run
 - **Multiple output formats** — `--format text` (default, ruff-style), `json`, `sarif` (GitHub Code Scanning / GitLab SAST), `junit`, `github` (PR annotations)
 - **Project config** — `.glint.yml` for rule suppression, severity overrides, token/URL defaults; `# glint: ignore RULE` for per-job inline suppression
-- **Graph visualization** — `glint graph` prints a terminal job tree; `glint graph pipeline` renders a GitLab CI-style SVG/PNG
+- **Graph visualization** — `glint graph` prints a terminal job tree; `glint graph pipeline` renders a GitLab CI-style SVG/PNG; `--format mermaid` emits a Mermaid flowchart; `--format html` produces a self-contained HTML file with pan/zoom and a job-detail sidebar; context flags grey out skipped jobs
 
 See [FEATURES.md](FEATURES.md) for the complete feature reference and lint rules table, and [ROADMAP.md](ROADMAP.md) for planned improvements.
 

ROADMAP.md

@@ -71,12 +71,12 @@ The SVG renderer and terminal tree cover the basic layout. These would bring it
 
 - ~~**Terminal job tree**~~ — ✓ shipped in v0.2.0 as `glint graph tree`; stages as branches, jobs as leaves, context-aware annotations
 - ~~**`glint graph includes` shows jobs per file**~~ — ✓ shipped post-v0.2.0; each include node shows the jobs it defines as dashed-arrow rounded nodes in a distinct style
-- **Multi-job connector accuracy** — draw one connector per job pair rather than one per stage pair in classic mode, so pipelines with uneven columns look correct
+- ~~**Multi-job connector accuracy**~~ — ✓ shipped v0.2.25; classic mode uses a bus-bar pattern (vertical rail at the midpoint + horizontal stubs per job) instead of a single center-to-center line, so uneven columns look correct
-- **Job tooltip / detail panel** — embed a hidden `<title>` and `<desc>` per chip so SVG viewers show `stage`, `when`, `image`, and `needs` on hover
+- ~~**Job tooltip / detail panel**~~ — ✓ shipped v0.2.25; each chip is wrapped in `<g data-job="…"><title>…</title><desc>…</desc>` — SVG viewers show stage, when, image, and needs on hover; HTML output uses the data for the sidebar
-- **`when: on_failure` visual distinction** — dashed border or distinct icon for failure-path jobs
+- ~~**`when: on_failure` visual distinction**~~ — ✓ shipped v0.2.25; dashed chip border + X-mark icon + red circle (`#d9534f`); legend entry added; Mermaid `on_failure` class wired
-- **Blocked / skipped state colouring** — grey out jobs that are statically unreachable given known `rules:` conditions
+- ~~**Blocked / skipped state colouring**~~ — ✓ shipped v0.2.25; `glint graph pipeline` accepts context flags (`--branch`, `--tag`, etc.); jobs evaluated as skipped are greyed out (`#868686`) with dimmed text and no icon
-- **Interactive HTML output** — self-contained `.html` file with pan/zoom and a job-detail sidebar; no external dependencies
+- ~~**Interactive HTML output**~~ — ✓ shipped v0.2.25; `glint graph pipeline --format html` writes a self-contained `.html` file with mouse pan/zoom and a click-to-open job-detail sidebar; no external dependencies
-- **Mermaid pipeline output** — keep `pipeline.go` but wire it up through `--graph pipeline --format mermaid` for users who want to paste into mermaid.live
+- ~~**Mermaid pipeline output**~~ — ✓ shipped v0.2.25; `glint graph pipeline --format mermaid` prints a Mermaid flowchart to stdout (paste into mermaid.live)
 
 ---
 
@@ -113,7 +113,7 @@ The SVG renderer and terminal tree cover the basic layout. These would bring it
 
 ## Reliability and developer experience
 
-- ~~**Structured rule IDs**~~ — ✓ shipped post-v0.2.0; GL001–GL031 assigned; GL032 added v0.2.11; GL033 added v0.2.15; GL034–GL041 added v0.2.16; output formats (--format json/sarif/junit/github) added v0.2.18; GL042–GL043 added v0.2.20; GL044 added v0.2.24
+- ~~**Structured rule IDs**~~ — ✓ shipped post-v0.2.0; GL001–GL031 assigned; GL032 added v0.2.11; GL033 added v0.2.15; GL034–GL041 added v0.2.16; output formats (--format json/sarif/junit/github) added v0.2.18; GL042–GL043 added v0.2.20; GL044 added v0.2.24; graph improvements shipped v0.2.25
 - ~~**`glint explain <rule-id>`**~~ — ✓ shipped v0.2.20; prints rule description, rationale, bad-YAML example, and fix; `glint explain` (no arg) lists all rules
 - ~~**Semantic versioning and first release**~~ — shipped as `v0.1.0` (2026-06-07)
 - ~~**Subcommand CLI**~~ — shipped as `v0.2.0` (2026-06-11); `glint check` / `glint graph [mode]` with ruff-style `--help`

USAGE.md

@@ -206,7 +206,16 @@ glint graph includes .gitlab-ci.yml > includes.mmd
 glint graph pipeline .gitlab-ci.yml
 # prints the output path, e.g.: glint-out/pipeline-20260614-143022.png
 
-# Mermaid to stdout + pipeline file path to stderr
+# Pipeline graph with skipped-job colouring (grey out context-unreachable jobs)
+glint graph pipeline --branch main .gitlab-ci.yml
+
+# Interactive HTML with pan/zoom and job-detail sidebar
+glint graph pipeline --format html .gitlab-ci.yml
+
+# Mermaid flowchart of the pipeline to stdout
+glint graph pipeline --format mermaid .gitlab-ci.yml
+
+# Mermaid includes graph to stdout + pipeline SVG file path to stderr
 glint graph all .gitlab-ci.yml > includes.mmd
 
 # Custom output directory
@@ -224,6 +233,28 @@ include type: orange (main file), purple (project), green (component), blue
 
 **Pipeline graph** — GitLab CI-style SVG rendered to a timestamped file.
 Converted to PNG when `rsvg-convert`, `inkscape`, or `magick` is available.
+
+**Pipeline graph formats** (`--format`):
+
+| Flag | Output |
+|------|--------|
+| `svg` (default) | Write SVG/PNG to `--out` |
+| `html` | Write self-contained HTML to `--out` — inline SVG with mouse pan/zoom, drag, and a job-detail sidebar that opens on chip click |
+| `mermaid` | Print Mermaid flowchart to stdout |
+
+**Visual chip styles:**
+
+| Type | Colour | Icon | Border |
+|------|--------|------|--------|
+| regular | blue `#1f75cb` | checkmark | solid |
+| manual | orange `#fc6d26` | play triangle | solid |
+| trigger | purple `#6b4fbb` | chevron | solid |
+| delayed | yellow `#fca326` | clock | solid |
+| on_failure | red `#d9534f` | X mark | dashed |
+| skipped (context) | grey `#868686` | none | solid |
+
+Pass context flags (`--branch`, `--tag`, `--source`, `--var`) to grey out jobs
+that would be skipped in the given pipeline event.
 DAG mode (Bézier arrows between jobs) activates automatically when any job has
 a `needs:` list; classic mode uses stage-column connectors otherwise.
 

cmd/glint/main.go

@@ -445,7 +445,8 @@ func cmdGraph(args []string) {
 	gitlabURL := fs.String("gitlab-url", "", "GitLab instance URL (overrides CI_SERVER_URL / GITLAB_URL)")
 	cacheDir := fs.String("cache-dir", "", "directory to cache fetched remote includes (created if needed)")
 	offline := fs.Bool("offline", false, "skip all network calls; serve only from --cache-dir")
-	out := fs.String("out", "glint-out", "output directory for Mermaid graph files (pipeline mode)")
+	out := fs.String("out", "glint-out", "output directory for rendered graph files (pipeline mode)")
+	format := fs.String("format", "svg", "pipeline output format: svg, mermaid, or html")
 	fs.Usage = func() {
 		fmt.Fprintf(os.Stderr, "glint %s\n\n", version)
 		fmt.Fprint(os.Stderr, `Visualise the pipeline as a job tree and/or Mermaid graph.
@@ -462,6 +463,15 @@ Options:
           Output directory for rendered graph files.
           Used by the pipeline and all modes only. [default: glint-out]
 
+      --format <FORMAT>
+          Output format for pipeline mode: svg (default), mermaid, or html.
+          svg:     write a GitLab CI-style SVG/PNG to --out (converted to PNG
+                   when rsvg-convert, inkscape, or magick is available).
+          mermaid: print a Mermaid flowchart to stdout (paste into mermaid.live).
+          html:    write a self-contained HTML file with pan/zoom and a
+                   job-detail sidebar to --out.
+          [default: svg] [possible values: svg, mermaid, html]
+
       --token <TOKEN>
           GitLab personal access token. Used to fetch remote project: includes
           when building the include dependency graph.
@@ -518,6 +528,8 @@ Examples:
   glint graph includes .gitlab-ci.yml > includes.mmd
   glint graph pipeline .gitlab-ci.yml
   glint graph pipeline --out /tmp/graphs .gitlab-ci.yml
+  glint graph pipeline --format mermaid .gitlab-ci.yml
+  glint graph pipeline --format html .gitlab-ci.yml
   glint graph all .gitlab-ci.yml > includes.mmd
 `)
 	}
@@ -602,16 +614,29 @@ Examples:
 	case "includes":
 		fmt.Print(graph.Includes(path, p.Include, cfg))
 	case "pipeline":
-		outPath, err := graph.RenderPipeline(p, *out)
+		switch *format {
+		case "mermaid":
+			fmt.Print(graph.Pipeline(p))
+		case "html":
+			outPath, err := graph.RenderHTML(p, *out, ctx)
 			if err != nil {
 				fmt.Fprintf(os.Stderr, "error: rendering pipeline graph: %v\n", err)
 				exit(2)
 				return
 			}
 			fmt.Println(outPath)
+		default: // "svg"
+			outPath, err := graph.RenderPipeline(p, *out, ctx)
+			if err != nil {
+				fmt.Fprintf(os.Stderr, "error: rendering pipeline graph: %v\n", err)
+				exit(2)
+				return
+			}
+			fmt.Println(outPath)
+		}
 	case "all":
 		fmt.Print(graph.Includes(path, p.Include, cfg))
-		outPath, err := graph.RenderPipeline(p, *out)
+		outPath, err := graph.RenderPipeline(p, *out, ctx)
 		if err != nil {
 			fmt.Fprintf(os.Stderr, "error: rendering pipeline graph: %v\n", err)
 			exit(2)

internal/graph/pipeline.go

@@ -27,6 +27,7 @@ func Pipeline(p *model.Pipeline) string {
 	w("    classDef manual fill:#fc6d26,stroke:#e56b1f,color:#fff")
 	w("    classDef trigger fill:#6b4fbb,stroke:#5a3fa0,color:#fff")
 	w("    classDef delayed fill:#fca326,stroke:#d98a1e,color:#333")
+	w("    classDef on_failure fill:#d9534f,stroke:#c0392b,color:#fff")
 	w("")
 
 	// Collect visible (non-template) job names; sort for stable output.
@@ -149,6 +150,8 @@ func jobClass(job model.Job) string {
 		return "manual"
 	case "delayed":
 		return "delayed"
+	case "on_failure":
+		return "on_failure"
 	}
 	return "regular"
 }

internal/graph/pipeline_test.go

@@ -105,10 +105,23 @@ func TestSanitizeID(t *testing.T) {
 func TestJobClass(t *testing.T) {
 	if jobClass(model.Job{When: "manual"}) != "manual" { t.Error("manual") }
 	if jobClass(model.Job{When: "delayed"}) != "delayed" { t.Error("delayed") }
+	if jobClass(model.Job{When: "on_failure"}) != "on_failure" { t.Error("on_failure") }
 	if jobClass(model.Job{Trigger: "x"}) != "trigger" { t.Error("trigger") }
 	if jobClass(model.Job{}) != "regular" { t.Error("regular") }
 }
 
+func TestPipeline_OnFailureClass(t *testing.T) {
+	p := &model.Pipeline{
+		Stages: []string{"cleanup"},
+		Jobs: map[string]model.Job{
+			"cleanup-job": {Name: "cleanup-job", Stage: "cleanup", When: "on_failure"},
+		},
+	}
+	out := Pipeline(p)
+	if !strings.Contains(out, "on_failure") { t.Error("expected on_failure class") }
+	if !strings.Contains(out, "#d9534f") { t.Error("expected on_failure color in classDef") }
+}
+
 // ── needsJobName ──────────────────────────────────────────────────────────────
 
 func TestNeedsJobName(t *testing.T) {

internal/graph/render.go

@@ -10,6 +10,7 @@ import (
 	"strings"
 	"time"
 
+	"git.k3nny.fr/glint/internal/cicontext"
 	"git.k3nny.fr/glint/internal/model"
 )
 
@@ -32,12 +33,12 @@ type svgPt struct{ x, y int }
 
 // RenderPipeline writes a PNG (or SVG fallback) file with a GitLab CI-style
 // pipeline layout and returns the path to the generated file.
-func RenderPipeline(p *model.Pipeline, outDir string) (string, error) {
+func RenderPipeline(p *model.Pipeline, outDir string, ctx *cicontext.Context) (string, error) {
 	if err := os.MkdirAll(outDir, 0o755); err != nil {
 		return "", fmt.Errorf("creating output directory %s: %w", outDir, err)
 	}
 
-	svg := pipelineSVG(p)
+	svg := pipelineSVG(p, ctx)
 
 	ts := time.Now().Format("20060102-150405")
 	svgPath := filepath.Join(outDir, "pipeline-"+ts+".svg")
@@ -53,6 +54,24 @@ func RenderPipeline(p *model.Pipeline, outDir string) (string, error) {
 	return svgPath, nil
 }
 
+// RenderHTML writes a self-contained HTML file with the pipeline graph embedded
+// inline with pan/zoom and a job-detail sidebar, then returns the output path.
+func RenderHTML(p *model.Pipeline, outDir string, ctx *cicontext.Context) (string, error) {
+	if err := os.MkdirAll(outDir, 0o755); err != nil {
+		return "", fmt.Errorf("creating output directory %s: %w", outDir, err)
+	}
+
+	svg := pipelineSVG(p, ctx)
+	html := htmlPage(svg)
+
+	ts := time.Now().Format("20060102-150405")
+	htmlPath := filepath.Join(outDir, "pipeline-"+ts+".html")
+	if err := os.WriteFile(htmlPath, []byte(html), 0o644); err != nil {
+		return "", fmt.Errorf("writing HTML: %w", err)
+	}
+	return htmlPath, nil
+}
+
 // convertToPNG tries rsvg-convert, Inkscape, magick, and convert (not on Windows).
 func convertToPNG(svgPath, pngPath string) bool {
 	candidates := [][]string{
@@ -75,7 +94,7 @@ func convertToPNG(svgPath, pngPath string) bool {
 	return false
 }
 
-func pipelineSVG(p *model.Pipeline) string {
+func pipelineSVG(p *model.Pipeline, ctx *cicontext.Context) string {
 	// Collect visible (non-template) job names in sorted order.
 	var visible []string
 	for name := range p.Jobs {
@@ -89,6 +108,16 @@ func pipelineSVG(p *model.Pipeline) string {
 		return svgEmpty()
 	}
 
+	// Precompute which jobs are skipped in the given context.
+	skippedJobs := make(map[string]bool)
+	if ctx != nil {
+		for _, name := range visible {
+			if cicontext.EvalJob(p.Jobs[name], ctx) == cicontext.JobSkipped {
+				skippedJobs[name] = true
+			}
+		}
+	}
+
 	// Group by stage; fall back to "test" (GitLab default) when stage is unset.
 	byStage := make(map[string][]string)
 	for _, name := range visible {
@@ -120,8 +149,6 @@ func pipelineSVG(p *model.Pipeline) string {
 	}
 
 	// Compute per-stage column heights and job anchor points for connectors.
-	colH := make([]int, len(stages))   // height of the chip stack (no label)
-	colCtY := make([]int, len(stages)) // y centre of the chip stack
 	maxColH := 0
 	rightMid := make(map[string]svgPt)
 	leftMid := make(map[string]svgPt)
@@ -131,7 +158,6 @@ func pipelineSVG(p *model.Pipeline) string {
 		sort.Strings(jobs)
 		n := len(jobs)
 		h := n*chipH + max(0, n-1)*chipGap
-		colH[i] = h
 		if h > maxColH {
 			maxColH = h
 		}
@@ -141,7 +167,6 @@ func pipelineSVG(p *model.Pipeline) string {
 			rightMid[name] = svgPt{cx + chipW, chy + chipH/2}
 			leftMid[name] = svgPt{cx, chy + chipH/2}
 		}
-		colCtY[i] = topPad + labelH + h/2
 	}
 
 	svgW := sidePad*2 + len(stages)*chipW + max(0, len(stages)-1)*stageGap
@@ -190,29 +215,73 @@ func pipelineSVG(p *model.Pipeline) string {
 		wf(`  <line x1="%d" y1="%d" x2="%d" y2="%d" stroke="#eaeaea" stroke-width="1"/>`,
 			cx, topPad+21, cx+chipW, topPad+21)
 
-		// Job chips.
+		// Job chips – each wrapped in a <g> with tooltip metadata.
 		for j, name := range jobs {
 			job := p.Jobs[name]
 			chy := topPad + labelH + j*(chipH+chipGap)
+			isSkipped := skippedJobs[name]
+
+			// Build <desc> content: shown in the HTML sidebar and SVG viewer tooltips.
+			desc := "stage: " + stage
+			if job.When != "" {
+				desc += "\nwhen: " + job.When
+			}
+			if img := imageString(job.Image); img != "" {
+				desc += "\nimage: " + img
+			}
+			var needNames []string
+			for _, n := range job.Needs {
+				if s := needsJobName(n); s != "" {
+					needNames = append(needNames, s)
+				}
+			}
+			if len(needNames) > 0 {
+				desc += "\nneeds: " + strings.Join(needNames, ", ")
+			}
+			if isSkipped {
+				desc += "\nstate: skipped"
+			}
+
+			// data-job attribute enables JS click detection in the HTML output.
+			wf(`  <g data-job="%s">`, svgEsc(name))
+			wf(`    <title>%s</title>`, svgEsc(name))
+			wf(`    <desc>%s</desc>`, svgEsc(desc))
+
 			color := chipColor(job)
+			if isSkipped {
+				color = "#868686"
+			}
 
 			// Chip card (white, rounded, subtle border + shadow).
+			// on_failure jobs get a dashed border to signal the failure path.
+			dashAttr := ""
+			if !isSkipped && job.When == "on_failure" {
+				dashAttr = ` stroke-dasharray="4,3"`
+			}
 			wf(`    <rect x="%d" y="%d" width="%d" height="%d" rx="4" `+
-				`fill="#ffffff" stroke="#dde1e7" stroke-width="1" filter="url(#chip-shadow)"/>`,
+				`fill="#ffffff" stroke="#dde1e7" stroke-width="1"%s filter="url(#chip-shadow)"/>`,
-				cx, chy, chipW, chipH)
+				cx, chy, chipW, chipH, dashAttr)
 
 			// Colored status indicator circle.
 			wf(`    <circle cx="%d" cy="%d" r="%d" fill="%s"/>`,
 				cx+iconCX, chy+chipH/2, iconR, color)
 
-			// Icon symbol inside the circle.
+			// Icon inside the circle (omitted for skipped — grey circle speaks for itself).
+			if !isSkipped {
 				drawChipIcon(&sb, job, cx+iconCX, chy+chipH/2)
+			}
 
-			// Job name text.
+			// Job name text — dimmed for skipped jobs.
+			textColor := "#303030"
+			if isSkipped {
+				textColor = "#868686"
+			}
 			wf(`    <text x="%d" y="%d" dominant-baseline="middle" `+
 				`font-family="'GitLab Sans','Segoe UI',-apple-system,BlinkMacSystemFont,sans-serif" `+
-				`font-size="13" fill="#303030">%s</text>`,
+				`font-size="13" fill="%s">%s</text>`,
-				cx+textLeft, chy+chipH/2, svgEsc(svgTrunc(name, 20)))
+				cx+textLeft, chy+chipH/2, textColor, svgEsc(svgTrunc(name, 20)))
+
+			wf(`  </g>`)
 		}
 	}
 
@@ -241,27 +310,54 @@ func pipelineSVG(p *model.Pipeline) string {
 			}
 		}
 	} else {
-		// Classic: one connector per adjacent stage pair.
+		// Classic: bus-bar connectors – every job in stage[i] fans to a vertical
+		// bus at the midpoint column gap, then fans out to every job in stage[i+1].
+		// This gives each job pair its own visual connection instead of a single
+		// center-to-center line that misses jobs at the top and bottom of columns.
 		for i := 0; i < len(stages)-1; i++ {
-			x1 := sidePad + i*(chipW+stageGap) + chipW
+			x1 := sidePad + i*(chipW+stageGap) + chipW // right edge of left column
-			x2 := sidePad + (i+1)*(chipW+stageGap)
+			x2 := sidePad + (i+1)*(chipW+stageGap)    // left edge of right column
-			y1 := colCtY[i]
-			y2 := colCtY[i+1]
 			midX := (x1 + x2) / 2
 
-			if y1 == y2 {
+			srcJobs := byStage[stages[i]]
-				// Straight horizontal line.
+			sort.Strings(srcJobs)
-				wf(`  <line x1="%d" y1="%d" x2="%d" y2="%d" stroke="%s" stroke-width="2"/>`,
+			dstJobs := byStage[stages[i+1]]
-					x1, y1, x2-7, y2, connStroke)
+			sort.Strings(dstJobs)
-			} else {
+
-				// L-shaped elbow: right → vertical → right.
+			// Collect all Y midpoints to span the vertical bus bar.
-				wf(`  <polyline points="%d,%d %d,%d %d,%d %d,%d" `+
+			var allYs []int
-					`stroke="%s" stroke-width="2" fill="none" stroke-linejoin="round"/>`,
+			srcY := make([]int, len(srcJobs))
-					x1, y1, midX, y1, midX, y2, x2-7, y2, connStroke)
+			dstY := make([]int, len(dstJobs))
+			for j, name := range srcJobs {
+				srcY[j] = rightMid[name].y
+				allYs = append(allYs, srcY[j])
 			}
-			// Arrowhead at the destination.
+			for j, name := range dstJobs {
+				dstY[j] = leftMid[name].y
+				allYs = append(allYs, dstY[j])
+			}
+			sort.Ints(allYs)
+			busMinY, busMaxY := allYs[0], allYs[len(allYs)-1]
+
+			// Vertical bus bar at midX (only drawn when there are multiple Y levels).
+			if busMinY < busMaxY {
+				wf(`  <line x1="%d" y1="%d" x2="%d" y2="%d" stroke="%s" stroke-width="2"/>`,
+					midX, busMinY, midX, busMaxY, connStroke)
+			}
+
+			// Horizontal stubs from each source job to the bus.
+			for _, y := range srcY {
+				wf(`  <line x1="%d" y1="%d" x2="%d" y2="%d" stroke="%s" stroke-width="2"/>`,
+					x1, y, midX, y, connStroke)
+			}
+
+			// Horizontal stubs from bus to each destination job, with arrowhead.
+			for _, y := range dstY {
+				wf(`  <line x1="%d" y1="%d" x2="%d" y2="%d" stroke="%s" stroke-width="2"/>`,
+					midX, y, x2-7, y, connStroke)
 				wf(`  <polygon points="%d,%d %d,%d %d,%d" fill="%s"/>`,
-				x2-7, y2-4, x2, y2, x2-7, y2+4, connStroke)
+					x2-7, y-4, x2, y, x2-7, y+4, connStroke)
+			}
 		}
 	}
 
@@ -271,6 +367,7 @@ func pipelineSVG(p *model.Pipeline) string {
 		{"#fc6d26", "manual"},
 		{"#6b4fbb", "trigger"},
 		{"#fca326", "delayed"},
+		{"#d9534f", "on_failure"},
 	}
 	const legendItemW = 82
 	legendY := topPad + labelH + maxColH + botPad/2
@@ -304,14 +401,20 @@ func drawChipIcon(sb *strings.Builder, job model.Job, cx, cy int) {
 		fmt.Fprintf(sb, "    <polygon points=\"%d,%d %d,%d %d,%d\" fill=\"#fff\"/>\n",
 			cx-3, cy-4, cx+5, cy, cx-3, cy+4)
 	case "delayed":
-		// Clock hands: vertical + horizontal.
+		// Clock: circle + hands.
 		fmt.Fprintf(sb, "    <circle cx=\"%d\" cy=\"%d\" r=\"5\" stroke=\"#fff\" stroke-width=\"1.2\" fill=\"none\"/>\n", cx, cy)
 		fmt.Fprintf(sb, "    <line x1=\"%d\" y1=\"%d\" x2=\"%d\" y2=\"%d\" stroke=\"#fff\" stroke-width=\"1.2\" stroke-linecap=\"round\"/>\n",
 			cx, cy, cx, cy-3)
 		fmt.Fprintf(sb, "    <line x1=\"%d\" y1=\"%d\" x2=\"%d\" y2=\"%d\" stroke=\"#fff\" stroke-width=\"1.2\" stroke-linecap=\"round\"/>\n",
 			cx, cy, cx+2, cy+1)
+	case "on_failure":
+		// X mark for failure-path jobs.
+		fmt.Fprintf(sb, "    <line x1=\"%d\" y1=\"%d\" x2=\"%d\" y2=\"%d\" stroke=\"#fff\" stroke-width=\"1.5\" stroke-linecap=\"round\"/>\n",
+			cx-3, cy-3, cx+3, cy+3)
+		fmt.Fprintf(sb, "    <line x1=\"%d\" y1=\"%d\" x2=\"%d\" y2=\"%d\" stroke=\"#fff\" stroke-width=\"1.5\" stroke-linecap=\"round\"/>\n",
+			cx+3, cy-3, cx-3, cy+3)
 	default:
-		// Regular job: small white checkmark outline.
+		// Regular job: small white checkmark.
 		fmt.Fprintf(sb, "    <polyline points=\"%d,%d %d,%d %d,%d\" "+
 			"stroke=\"#fff\" stroke-width=\"1.5\" fill=\"none\" stroke-linecap=\"round\" stroke-linejoin=\"round\"/>\n",
 			cx-3, cy, cx-1, cy+3, cx+4, cy-3)
@@ -327,10 +430,25 @@ func chipColor(job model.Job) string {
 		return "#fc6d26"
 	case "delayed":
 		return "#fca326"
+	case "on_failure":
+		return "#d9534f"
 	}
 	return "#1f75cb"
 }
 
+// imageString extracts the image name from a job Image field (string or map form).
+func imageString(img any) string {
+	switch v := img.(type) {
+	case string:
+		return v
+	case map[string]any:
+		if name, ok := v["name"].(string); ok {
+			return name
+		}
+	}
+	return ""
+}
+
 func svgEsc(s string) string {
 	s = strings.ReplaceAll(s, "&", "&amp;")
 	s = strings.ReplaceAll(s, "<", "&lt;")
@@ -356,3 +474,179 @@ func svgEmpty() string {
 			`</svg>`,
 		w, h, w, h, w/2, h/2)
 }
+
+// htmlPage wraps an SVG pipeline graph in a self-contained HTML page with
+// mouse pan/zoom and a job-detail sidebar that appears on chip click.
+func htmlPage(svgContent string) string {
+	var sb strings.Builder
+	sb.WriteString(`<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="UTF-8">
+<meta name="viewport" content="width=device-width,initial-scale=1">
+<title>Pipeline Graph</title>
+<style>
+*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
+body {
+  font-family: 'Segoe UI', Arial, sans-serif;
+  background: #f5f5f5;
+  display: flex;
+  height: 100vh;
+  overflow: hidden;
+}
+#sidebar {
+  width: 260px;
+  flex-shrink: 0;
+  background: #fff;
+  border-right: 1px solid #e0e0e0;
+  display: none;
+  flex-direction: column;
+  overflow-y: auto;
+}
+#sidebar.open { display: flex; }
+#sidebar-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: .6rem .8rem;
+  border-bottom: 1px solid #e0e0e0;
+  background: #fafafa;
+  flex-shrink: 0;
+}
+#sidebar-header h3 {
+  font-size: .9rem;
+  color: #303030;
+  word-break: break-all;
+}
+#close-btn {
+  background: none;
+  border: none;
+  cursor: pointer;
+  font-size: 1rem;
+  color: #868686;
+  padding: .2rem .4rem;
+  margin-left: .4rem;
+  flex-shrink: 0;
+}
+#close-btn:hover { color: #303030; }
+#sidebar-body { padding: .8rem; flex: 1; }
+#sidebar-body pre {
+  font-size: .82rem;
+  color: #555;
+  white-space: pre-wrap;
+  line-height: 1.6;
+}
+#viewport {
+  flex: 1;
+  overflow: hidden;
+  cursor: grab;
+  position: relative;
+  background: #f5f5f5;
+}
+#viewport.dragging { cursor: grabbing; }
+#svg-wrap {
+  display: inline-block;
+  transform-origin: 0 0;
+  padding: 20px;
+}
+g[data-job] { cursor: pointer; }
+g[data-job]:hover > rect { stroke: #1f75cb; stroke-width: 2; }
+</style>
+</head>
+<body>
+<div id="sidebar">
+  <div id="sidebar-header">
+    <h3 id="sidebar-title">Job details</h3>
+    <button id="close-btn" title="Close">&#x2715;</button>
+  </div>
+  <div id="sidebar-body">
+    <pre id="sidebar-details"></pre>
+  </div>
+</div>
+<div id="viewport">
+  <div id="svg-wrap">
+`)
+	sb.WriteString(svgContent)
+	sb.WriteString(`
+  </div>
+</div>
+<script>
+(function() {
+  'use strict';
+  var vp = document.getElementById('viewport');
+  var wrap = document.getElementById('svg-wrap');
+  var sidebar = document.getElementById('sidebar');
+  var titleEl = document.getElementById('sidebar-title');
+  var detailsEl = document.getElementById('sidebar-details');
+  var tx = 0, ty = 0, scale = 1;
+
+  function applyTransform() {
+    wrap.style.transform = 'translate(' + tx + 'px,' + ty + 'px) scale(' + scale + ')';
+  }
+
+  // Zoom toward the cursor position.
+  vp.addEventListener('wheel', function(e) {
+    e.preventDefault();
+    var factor = e.deltaY < 0 ? 1.1 : 1 / 1.1;
+    var r = vp.getBoundingClientRect();
+    var mx = e.clientX - r.left;
+    var my = e.clientY - r.top;
+    tx = mx - (mx - tx) * factor;
+    ty = my - (my - ty) * factor;
+    scale *= factor;
+    applyTransform();
+  }, { passive: false });
+
+  // Drag to pan (skip if clicking on a job chip).
+  var dragging = false, ox = 0, oy = 0;
+  vp.addEventListener('mousedown', function(e) {
+    if (e.target.closest('g[data-job]')) return;
+    dragging = true;
+    ox = e.clientX - tx;
+    oy = e.clientY - ty;
+    vp.classList.add('dragging');
+  });
+  window.addEventListener('mousemove', function(e) {
+    if (!dragging) return;
+    tx = e.clientX - ox;
+    ty = e.clientY - oy;
+    applyTransform();
+  });
+  window.addEventListener('mouseup', function() {
+    dragging = false;
+    vp.classList.remove('dragging');
+  });
+
+  // Double-click on the background to reset the view.
+  vp.addEventListener('dblclick', function(e) {
+    if (e.target.closest('g[data-job]')) return;
+    tx = 0; ty = 0; scale = 1;
+    applyTransform();
+  });
+
+  // Click a job chip to show its details in the sidebar.
+  document.addEventListener('click', function(e) {
+    var g = e.target.closest('g[data-job]');
+    if (!g) return;
+    var jobName = g.dataset.job;
+    var descEl = g.querySelector('desc');
+    var desc = descEl ? descEl.textContent : '';
+    titleEl.textContent = jobName;
+    detailsEl.textContent = desc;
+    sidebar.classList.add('open');
+  });
+
+  // Close the sidebar.
+  document.getElementById('close-btn').addEventListener('click', function() {
+    sidebar.classList.remove('open');
+  });
+  document.addEventListener('keydown', function(e) {
+    if (e.key === 'Escape') sidebar.classList.remove('open');
+  });
+})();
+</script>
+</body>
+</html>
+`)
+	return sb.String()
+}

internal/graph/render_test.go

@@ -5,6 +5,7 @@ import (
 	"strings"
 	"testing"
 
+	"git.k3nny.fr/glint/internal/cicontext"
 	"git.k3nny.fr/glint/internal/model"
 )
 
@@ -59,9 +60,20 @@ func TestChipColor(t *testing.T) {
 	if chipColor(model.Job{Trigger: "x"}) != "#6b4fbb" { t.Error("trigger color") }
 	if chipColor(model.Job{When: "manual"}) != "#fc6d26" { t.Error("manual color") }
 	if chipColor(model.Job{When: "delayed"}) != "#fca326" { t.Error("delayed color") }
+	if chipColor(model.Job{When: "on_failure"}) != "#d9534f" { t.Error("on_failure color") }
 	if chipColor(model.Job{}) != "#1f75cb" { t.Error("regular color") }
 }
 
+// ── imageString ───────────────────────────────────────────────────────────────
+
+func TestImageString(t *testing.T) {
+	if imageString("alpine") != "alpine" { t.Error("string form") }
+	if imageString(map[string]any{"name": "golang:1.21"}) != "golang:1.21" { t.Error("map form") }
+	if imageString(map[string]any{"other": "x"}) != "" { t.Error("map without name key") }
+	if imageString(nil) != "" { t.Error("nil") }
+	if imageString(42) != "" { t.Error("unexpected type") }
+}
+
 // ── drawChipIcon ──────────────────────────────────────────────────────────────
 
 func TestDrawChipIcon(t *testing.T) {
@@ -72,6 +84,7 @@ func TestDrawChipIcon(t *testing.T) {
 		{model.Job{Trigger: "x"}, "<polyline"},
 		{model.Job{When: "manual"}, "<polygon"},
 		{model.Job{When: "delayed"}, "<circle"},
+		{model.Job{When: "on_failure"}, "<line"},
 		{model.Job{}, "<polyline"},
 	}
 	for _, tc := range cases {
@@ -86,7 +99,7 @@ func TestDrawChipIcon(t *testing.T) {
 // ── pipelineSVG ───────────────────────────────────────────────────────────────
 
 func TestPipelineSVG_Empty(t *testing.T) {
-	svg := pipelineSVG(&model.Pipeline{})
+	svg := pipelineSVG(&model.Pipeline{}, nil)
 	if !strings.Contains(svg, "no jobs defined") {
 		t.Errorf("expected 'no jobs defined', got:\n%s", svg)
 	}
@@ -100,13 +113,32 @@ func TestPipelineSVG_ClassicMode(t *testing.T) {
 			"test-job":  {Name: "test-job", Stage: "test"},
 		},
 	}
-	svg := pipelineSVG(p)
+	svg := pipelineSVG(p, nil)
 	if !strings.Contains(svg, "<svg") { t.Error("expected <svg") }
 	if !strings.Contains(svg, "build-job") { t.Error("expected build-job") }
 	if !strings.Contains(svg, "test-job") { t.Error("expected test-job") }
-	// Classic mode connector
+	// Classic mode bus-bar draws <line> elements for connectors
-	if !strings.Contains(svg, "<polyline") && !strings.Contains(svg, "<line") {
+	if !strings.Contains(svg, "<line") {
-		t.Error("expected connector in classic mode")
+		t.Error("expected <line> connector in classic mode")
+	}
+}
+
+func TestPipelineSVG_ClassicMode_MultiJob(t *testing.T) {
+	// Two source jobs, two destination jobs → bus-bar with vertical segment
+	p := &model.Pipeline{
+		Stages: []string{"build", "test"},
+		Jobs: map[string]model.Job{
+			"build-a": {Name: "build-a", Stage: "build"},
+			"build-b": {Name: "build-b", Stage: "build"},
+			"test-a":  {Name: "test-a", Stage: "test"},
+			"test-b":  {Name: "test-b", Stage: "test"},
+		},
+	}
+	svg := pipelineSVG(p, nil)
+	// Bus bar: horizontal stubs from each src + dst, plus a vertical bus line
+	// and an arrowhead polygon for each dst job.
+	if !strings.Contains(svg, "<polygon") {
+		t.Error("expected arrowhead <polygon> in multi-job classic mode")
 	}
 }
 
@@ -118,7 +150,7 @@ func TestPipelineSVG_DAGMode(t *testing.T) {
 			"test-job":  {Name: "test-job", Stage: "test", Needs: []any{"build-job"}},
 		},
 	}
-	svg := pipelineSVG(p)
+	svg := pipelineSVG(p, nil)
 	// DAG mode draws <path> bezier curves
 	if !strings.Contains(svg, "<path") {
 		t.Error("expected <path> connector in DAG mode")
@@ -126,7 +158,7 @@ func TestPipelineSVG_DAGMode(t *testing.T) {
 }
 
 func TestPipelineSVG_DAGMode_StraightConnector(t *testing.T) {
-	// Two stages at same height → straight <line> connector in classic mode
+	// Two stages at same height → straight connector in classic mode
 	p := &model.Pipeline{
 		Stages: []string{"a", "b"},
 		Jobs: map[string]model.Job{
@@ -134,7 +166,7 @@ func TestPipelineSVG_DAGMode_StraightConnector(t *testing.T) {
 			"j2": {Name: "j2", Stage: "b"},
 		},
 	}
-	svg := pipelineSVG(p)
+	svg := pipelineSVG(p, nil)
 	if !strings.Contains(svg, "<svg") { t.Error("expected <svg") }
 }
 
@@ -145,13 +177,18 @@ func TestPipelineSVG_AllJobTypes(t *testing.T) {
 			"manual-job":     {Name: "manual-job", Stage: "deploy", When: "manual"},
 			"delayed-job":    {Name: "delayed-job", Stage: "deploy", When: "delayed"},
 			"trigger-job":    {Name: "trigger-job", Stage: "deploy", Trigger: "other/project"},
+			"onfailure-job":  {Name: "onfailure-job", Stage: "deploy", When: "on_failure"},
 		},
 	}
-	svg := pipelineSVG(p)
+	svg := pipelineSVG(p, nil)
-	// Each type has its own color in the SVG
 	if !strings.Contains(svg, "#fc6d26") { t.Error("expected manual color") }
 	if !strings.Contains(svg, "#fca326") { t.Error("expected delayed color") }
 	if !strings.Contains(svg, "#6b4fbb") { t.Error("expected trigger color") }
+	if !strings.Contains(svg, "#d9534f") { t.Error("expected on_failure color") }
+	// on_failure chips have a dashed border
+	if !strings.Contains(svg, `stroke-dasharray="4,3"`) {
+		t.Error("expected dashed border on on_failure chip")
+	}
 }
 
 func TestPipelineSVG_JobNoStage(t *testing.T) {
@@ -160,7 +197,7 @@ func TestPipelineSVG_JobNoStage(t *testing.T) {
 			"myjob": {Name: "myjob"},
 		},
 	}
-	svg := pipelineSVG(p)
+	svg := pipelineSVG(p, nil)
 	if !strings.Contains(svg, "myjob") { t.Error("expected myjob") }
 }
 
@@ -172,10 +209,85 @@ func TestPipelineSVG_CrossPipelineNeed(t *testing.T) {
 				Needs: []any{map[string]any{"pipeline": "other", "job": "x"}}},
 		},
 	}
-	svg := pipelineSVG(p)
+	svg := pipelineSVG(p, nil)
 	if !strings.Contains(svg, "<svg") { t.Error("expected <svg") }
 }
 
+func TestPipelineSVG_Tooltip(t *testing.T) {
+	p := &model.Pipeline{
+		Stages: []string{"build"},
+		Jobs: map[string]model.Job{
+			"build-job": {
+				Name:  "build-job",
+				Stage: "build",
+				When:  "on_success",
+				Image: "golang:1.21",
+				Needs: []any{"prep-job"},
+			},
+		},
+	}
+	svg := pipelineSVG(p, nil)
+	// Tooltip <title> and <desc> should appear inside the <g data-job> wrapper
+	if !strings.Contains(svg, `<title>build-job</title>`) {
+		t.Error("expected <title>build-job</title>")
+	}
+	if !strings.Contains(svg, `<desc>`) {
+		t.Error("expected <desc> element")
+	}
+	if !strings.Contains(svg, "image: golang:1.21") {
+		t.Error("expected image in desc")
+	}
+	if !strings.Contains(svg, "needs: prep-job") {
+		t.Error("expected needs in desc")
+	}
+	if !strings.Contains(svg, `data-job="build-job"`) {
+		t.Error("expected data-job attribute")
+	}
+}
+
+func TestPipelineSVG_SkippedJob(t *testing.T) {
+	// A job with rules that never match in the given context should be greyed out.
+	p := &model.Pipeline{
+		Stages: []string{"deploy"},
+		Jobs: map[string]model.Job{
+			"deploy-job": {
+				Name:   "deploy-job",
+				Stage:  "deploy",
+				Script: []any{"deploy.sh"},
+				Rules: []model.Rule{
+					{If: `$CI_COMMIT_TAG != ""`, When: "on_success"},
+				},
+			},
+		},
+	}
+	// Branch context: CI_COMMIT_TAG is empty → rule doesn't match → job skipped
+	ctx := cicontext.New("main", "", "push", nil)
+	svg := pipelineSVG(p, ctx)
+
+	// Skipped jobs use grey (#868686) instead of the regular blue
+	if !strings.Contains(svg, `fill="#868686"`) {
+		t.Error("expected grey fill for skipped job circle")
+	}
+	// Skipped state should appear in the tooltip desc
+	if !strings.Contains(svg, "state: skipped") {
+		t.Error("expected 'state: skipped' in tooltip desc")
+	}
+}
+
+func TestPipelineSVG_ContextNil(t *testing.T) {
+	// nil context → no skipped jobs, regular colors
+	p := &model.Pipeline{
+		Stages: []string{"build"},
+		Jobs: map[string]model.Job{
+			"j": {Name: "j", Stage: "build"},
+		},
+	}
+	svg := pipelineSVG(p, nil)
+	if !strings.Contains(svg, `fill="#1f75cb"`) {
+		t.Error("expected regular blue fill with nil context")
+	}
+}
+
 // ── RenderPipeline ────────────────────────────────────────────────────────────
 
 func TestRenderPipeline(t *testing.T) {
@@ -186,7 +298,7 @@ func TestRenderPipeline(t *testing.T) {
 		},
 	}
 	dir := t.TempDir()
-	path, err := RenderPipeline(p, dir)
+	path, err := RenderPipeline(p, dir, nil)
 	if err != nil {
 		t.Fatalf("RenderPipeline: %v", err)
 	}
@@ -202,7 +314,7 @@ func TestRenderPipeline_InvalidDir(t *testing.T) {
 	if err := os.WriteFile(filePath, []byte("x"), 0o644); err != nil {
 		t.Fatal(err)
 	}
-	_, err := RenderPipeline(&model.Pipeline{}, filePath+"/nested")
+	_, err := RenderPipeline(&model.Pipeline{}, filePath+"/nested", nil)
 	if err == nil {
 		t.Error("expected error writing to path under a file")
 	}
@@ -222,7 +334,7 @@ func TestRenderPipeline_WriteFileFails(t *testing.T) {
 		Stages: []string{"build"},
 		Jobs:   map[string]model.Job{"j": {Name: "j", Stage: "build"}},
 	}
-	_, err := RenderPipeline(p, dir)
+	_, err := RenderPipeline(p, dir, nil)
 	if err == nil {
 		t.Error("expected error when writing SVG to read-only directory")
 	}
@@ -241,7 +353,7 @@ func TestRenderPipeline_SVGFallback(t *testing.T) {
 		Jobs:   map[string]model.Job{"j": {Name: "j", Stage: "build"}},
 	}
 	dir := t.TempDir()
-	path, err := RenderPipeline(p, dir)
+	path, err := RenderPipeline(p, dir, nil)
 	if err != nil {
 		t.Fatalf("RenderPipeline: %v", err)
 	}
@@ -264,7 +376,7 @@ func TestConvertToPNG_NoConverter(t *testing.T) {
 
 func TestConvertToPNG_FakeConverter(t *testing.T) {
 	// Install a fake rsvg-convert that just creates the output file and exits 0.
-	// This exercises the "return true" branch (line 72) and os.Remove in RenderPipeline.
+	// This exercises the "return true" branch and os.Remove in RenderPipeline.
 	binDir := t.TempDir()
 	script := "#!/bin/sh\n# rsvg-convert --output <out> <in>\ncp \"$3\" \"$2\"\n"
 	fakeBin := binDir + "/rsvg-convert"
@@ -303,7 +415,7 @@ func TestRenderPipeline_PNGConversion(t *testing.T) {
 		Jobs:   map[string]model.Job{"j": {Name: "j", Stage: "build"}},
 	}
 	dir := t.TempDir()
-	path, err := RenderPipeline(p, dir)
+	path, err := RenderPipeline(p, dir, nil)
 	if err != nil {
 		t.Fatalf("RenderPipeline: %v", err)
 	}
@@ -315,7 +427,7 @@ func TestRenderPipeline_PNGConversion(t *testing.T) {
 // ── pipelineSVG coverage gaps ─────────────────────────────────────────────────
 
 func TestPipelineSVG_LShapedElbow(t *testing.T) {
-	// Classic mode with unequal stage sizes → different column heights → L-shaped elbow
+	// Classic mode with unequal stage sizes → vertical bus bar required
 	p := &model.Pipeline{
 		Stages: []string{"build", "test"},
 		Jobs: map[string]model.Job{
@@ -324,9 +436,10 @@ func TestPipelineSVG_LShapedElbow(t *testing.T) {
 			"j3": {Name: "j3", Stage: "test"},
 		},
 	}
-	svg := pipelineSVG(p)
+	svg := pipelineSVG(p, nil)
-	if !strings.Contains(svg, "<polyline") {
+	// The bus bar is a <line>; arrowheads are <polygon>
-		t.Error("expected <polyline> for L-shaped elbow connector")
+	if !strings.Contains(svg, "<polygon") {
+		t.Error("expected <polygon> arrowhead in bus-bar connector")
 	}
 }
 
@@ -339,9 +452,82 @@ func TestPipelineSVG_DAGNeedNotInPositionMap(t *testing.T) {
 			".hidden-template": {Name: ".hidden-template", Stage: "build"},
 		},
 	}
-	svg := pipelineSVG(p)
+	svg := pipelineSVG(p, nil)
 	// Should render without panic; .hidden-template is not visible so no connector drawn.
 	if !strings.Contains(svg, "<svg") {
 		t.Error("expected valid SVG output")
 	}
 }
+
+// ── RenderHTML ────────────────────────────────────────────────────────────────
+
+func TestRenderHTML(t *testing.T) {
+	p := &model.Pipeline{
+		Stages: []string{"build"},
+		Jobs: map[string]model.Job{
+			"build-job": {Name: "build-job", Stage: "build"},
+		},
+	}
+	dir := t.TempDir()
+	path, err := RenderHTML(p, dir, nil)
+	if err != nil {
+		t.Fatalf("RenderHTML: %v", err)
+	}
+	if !strings.HasSuffix(path, ".html") {
+		t.Errorf("expected .html output, got %q", path)
+	}
+	data, err := os.ReadFile(path)
+	if err != nil {
+		t.Fatalf("reading output: %v", err)
+	}
+	html := string(data)
+	if !strings.Contains(html, "<!DOCTYPE html>") { t.Error("expected DOCTYPE") }
+	if !strings.Contains(html, "<svg") { t.Error("expected embedded <svg") }
+	if !strings.Contains(html, "build-job") { t.Error("expected job name in HTML") }
+	if !strings.Contains(html, "applyTransform") { t.Error("expected JS pan/zoom function") }
+	if !strings.Contains(html, "sidebar") { t.Error("expected sidebar element") }
+}
+
+func TestRenderHTML_InvalidDir(t *testing.T) {
+	dir := t.TempDir()
+	filePath := dir + "/notadir"
+	if err := os.WriteFile(filePath, []byte("x"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	_, err := RenderHTML(&model.Pipeline{}, filePath+"/nested", nil)
+	if err == nil {
+		t.Error("expected error writing to path under a file")
+	}
+}
+
+func TestRenderHTML_WriteFileFails(t *testing.T) {
+	if os.Getuid() == 0 {
+		t.Skip("skipping as root — file permissions don't apply")
+	}
+	dir := t.TempDir()
+	if err := os.Chmod(dir, 0o555); err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() { os.Chmod(dir, 0o755) })
+
+	p := &model.Pipeline{
+		Stages: []string{"build"},
+		Jobs:   map[string]model.Job{"j": {Name: "j", Stage: "build"}},
+	}
+	_, err := RenderHTML(p, dir, nil)
+	if err == nil {
+		t.Error("expected error when writing HTML to read-only directory")
+	}
+}
+
+// ── htmlPage ──────────────────────────────────────────────────────────────────
+
+func TestHtmlPage(t *testing.T) {
+	svgContent := `<svg xmlns="http://www.w3.org/2000/svg" width="100" height="50"><rect/></svg>`
+	html := htmlPage(svgContent)
+	if !strings.Contains(html, "<!DOCTYPE html>") { t.Error("expected DOCTYPE") }
+	if !strings.Contains(html, svgContent) { t.Error("expected SVG embedded in HTML") }
+	if !strings.Contains(html, "id=\"viewport\"") { t.Error("expected viewport element") }
+	if !strings.Contains(html, "id=\"sidebar\"") { t.Error("expected sidebar element") }
+	if !strings.Contains(html, "applyTransform") { t.Error("expected JS transform function") }
+}