Tab trap escape hatch: leave/enter the canvas with Escape/Enter

[ellatrix]

Context

Alternative to #82310.

Escape currently does nothing in the editor. Unfortunately we have lost Escape triggering navigation mode (#72193), which removed an escape hatch for the cases where Tab doesn't work.

Tab on the over hand is overloaded. In some contexts it manipulates the content (indent), and otherwise it moves focus to the inspector. Quite confusing.

I would say resolving this conflict is blocking further progress on several iterations:

• Tab to indent list items that are selected, or multi-selected.
• Tab to stop moving focus entirely at the start of a list item (even if indent/outdent is not possible), see List: in useMerge, consider preventing propagation of Tab/Shift-Tab keypress even if unable to indent/outdent #82184.
• Tab to indent text in the code block.

Additionally Tab can also easily be "trapped" by third party block that render editors like CodeMirror etc.

Solution

What would be the most natural key to press when being trapped? Still Escape, I'd say.

What if Escape moves focus to the iframe wrapper? From there, it's now possible to get to the block toolbar and inspector. Press Enter to... enter it again. Or Escape again, or Space, or F2 (normative way to enter "cells").

Btw, often an argument against using Escape that it's already used to switch back to browse mode in JAWS/NVDA. That's true, but I don't think it's a blocker. For people who use screen readers, it will simply take two Escape presses to navigate to exit, where the first press escapes the "focus mode" use for writing in blocks. When already in "browse mode", it just takes one press. On top of that, screen readers have their own dedicated keys to navigate regions/landmarks, so they have a lesser need of it.

Prior Art

I discovered that some web editors actually use the same exact pattern. Here's Github:

CodeMirror:

However, I understand that people expect the Tab key do something indentation-related in code editor controls. To that purpose, CodeMirror has a built-in escape hatch: If you press the Escape key, and then press Tab directly after it, the editor never handles the Tab press, so that you can use that to move focus. In addition, the default keymap binds Ctrl-m (or Shift-Alt-m) on macOS to the toggleTabFocusMode command, which toggles a similar behavior.

https://codemirror.net/examples/tab/

Demo

Escape steps out (ring and hint), and Tab passes the canvas to the settings sidebar. Coming back in is direct: Shift+Tab from the sidebar and Tab from the block toolbar land in the text again, because focus arriving on the canvas engages it. From the stop, Shift+Tab reaches the block toolbar, and Enter returns to the caret:

canvas-stop-demo.mp4

With a screen reader, first NVDA with its Speech Viewer transcribing the announcements, then JAWS with its virtual cursor highlight. The extra first Escape is the screen reader leaving its typing mode; Escape then steps out onto the stop, which is announced by name, role, and hint. Tab and Shift+Tab pass the canvas, and Enter on the stop goes back in from browse mode (screen readers activate a button with a click), where typing lands at the remembered caret right away:

canvas-stop-screen-readers.mp4

Testing Instructions

1. Click into a paragraph, press Escape: the canvas is outlined and the hint appears. The block selection stays.
2. Tab: focus moves past the canvas to the settings sidebar. Shift+Tab: straight back into the text. Escape, then Shift+Tab: onto the block toolbar; Tab from there: straight back into the text.
3. Enter (or Escape, or F2) on the stop: focus and caret return to where you left them.
4. Type * , press Escape: the automatic change is undone and focus stays in the text.
5. Repeat in the site editor, the widgets screen, and the customizer.

E2e coverage lives in the existing suites: keyboard-navigable-blocks (a "Canvas as a single tab stop" group), toolbar-roving-tabindex, and list.

Written with the help of an AI assistant.

Summary by CodeRabbit

Accessibility

• Added a single, keyboard-accessible stop for entering and leaving the editor canvas.
• Improved focus restoration for blocks, selections, toolbars, sidebars, and zoomed sections.
• Added visible focus styling and guidance for the canvas stop.

Keyboard Navigation

• Improved Tab, Shift+Tab, Enter, and Escape navigation throughout the editor.
• Escape preserves selections and returns focus appropriately.
• Keyboard navigation now accounts for text composition.

Editing

• Backspace and Escape can undo eligible automatic changes while preserving expected focus behavior.

[github-actions]

🤖 PR meta 🤖

📦 Bundle size

Size Change: +1.59 kB (+0.02%)

Total Size: 8.01 MB

📦 View Changed

Filename	Size	Change
build/scripts/block-editor/index.min.js	479 kB	+321 B (+0.07%)
build/styles/block-editor/style-rtl.css	20.5 kB	+459 B (+2.29%)
build/styles/block-editor/style-rtl.min.css	17.3 kB	+174 B (+1.02%)
build/styles/block-editor/style.css	20.5 kB	+459 B (+2.29%)
build/styles/block-editor/style.min.css	17.3 kB	+174 B (+1.02%)

_{d7d9113 Run}

⚡ Performance

Show the results

Client side metrics exclude the server response time.

front-end-block-theme

Metric	901e8ef	trunk	% Change
timeToFirstByte	62.85 ms +8.51% -12.33%	65.95 ms +7.73% -12.81%	-4.7%
largestContentfulPaint	100 ms +4% -12%	96 ms +10.42% -8.33%	4.17%
lcpMinusTtfb	33.1 ms +29.61% -5.89%	31.4 ms +7.01% -5.89%	5.41%
wpBeforeTemplate	34.14 ms +6.65% -19.45%	33.88 ms +10.77% -19.51%	0.77%
wpTemplate	24.46 ms +4.37% -3.27%	27.05 ms +2.48% -5.47%	-9.57%
wpTotal	58.07 ms +7.82% -11.38%	61.17 ms +5.98% -12.44%	-5.07%
wpMemoryUsage	7.54 MB +0% -0%	7.50 MB +0% -0%	0.46%
wpDbQueries	17 +0% -0%	17 +0% -0%	0%

front-end-classic-theme

Metric	901e8ef	trunk	% Change
timeToFirstByte	40.15 ms +13.08% -8.84%	50.2 ms +9.96% -5.08%	-20.02%
largestContentfulPaint	80 ms +7.5% -2.5%	96 ms +6.25% -4.17%	-16.67%
lcpMinusTtfb	40.6 ms +6.16% -1.85%	45.3 ms +4.86% -0.77%	-10.38%
wpBeforeTemplate	24.77 ms +22.97% -3.84%	25.52 ms +17.87% -6.07%	-2.94%
wpTemplate	10.31 ms +5.24% -3.98%	20.31 ms +5.32% -4.28%	-49.24%
wpTotal	36.45 ms +14.29% -7.27%	46.85 ms +8.75% -5.08%	-22.2%
wpMemoryUsage	5.42 MB +0% -0%	6.12 MB +0% -0%	-11.5%
wpDbQueries	10 +0% -0%	14 +0% -0%	-28.57%

media-processing

Metric	901e8ef	trunk	% Change
mediaProcessingJpeg	415.39 ms +0.1% -1.42%	411.29 ms +0.48% -0.12%	1%
mediaProcessingAvif	6399.82 ms +0.42% -0.12%	6407.06 ms +0.56% -0.18%	-0.11%
mediaProcessingJpegToAvif	4575.55 ms +0.09% -0.08%	4547.63 ms +0.49% -0.24%	0.61%

media-upload

Metric	901e8ef	trunk	% Change
jpegUploadProcessing	1474.32 ms +32.56% -3.41%	1413.03 ms +0.74% -0.65%	4.34%
pngUploadProcessing	208.68 ms +5.75% -5.24%	216.29 ms +0.65% -1.34%	-3.52%
largeJpegUploadProcessing	1442.74 ms +0.28% -0.68%	1408.46 ms +0.74% -0.44%	2.43%
multipleImageUploadProcessing	1550.45 ms +1.22% -0.91%	1568.25 ms +0.05% -0.83%	-1.14%

post-editor

Metric	901e8ef	trunk	% Change
serverResponse	374.92 ms +6.75% -6.98%	385.29 ms +2.34% -2.08%	-2.69%
firstPaint	217.53 ms +20.15% -7.32%	186.25 ms +10.14% -23.88%	16.79%
domContentLoaded	1037.62 ms +0.6% -0.45%	1016.11 ms +1.67% -0.86%	2.12%
loaded	1038.65 ms +0.59% -0.45%	1017.21 ms +1.66% -0.86%	2.11%
firstContentfulPaint	345.65 ms +2.46% -1.84%	336.9 ms +1.24% -1.79%	2.6%
firstBlock	2725.91 ms +0.46% -0.41%	2694.81 ms +1.23% -0.55%	1.15%
type	17.31 ms +11.15% -13.29%	16.34 ms +9.18% -16.34%	5.94%
typeWithoutInspector	16.52 ms +12.41% -13.86%	17.17 ms +10.6% -16.6%	-3.79%
typeWithTopToolbar	20.46 ms +2.59% -13%	20.92 ms +1.82% -17.16%	-2.2%
typeContainer	7.78 ms +16.2% -6.68%	8.64 ms +7.52% -9.72%	-9.95%
focus	65.01 ms +13.38% -2.17%	70.95 ms +13.11% -7.34%	-8.37%
firstFocus	140.25 ms +0% -0%	142.81 ms +0% -0%	-1.79%
selectAll	406.41 ms +1.8% -1.38%	392.9 ms +1.55% -1.81%	3.44%
listViewOpen	52.49 ms +20.37% -3.18%	56.9 ms +7.59% -10.23%	-7.75%
inserterOpen	20.41 ms +3.87% -8.28%	19.18 ms +13.56% -2.03%	6.41%
inserterHover	3.48 ms +10.34% -6.03%	3.74 ms +4.81% -11.23%	-6.95%
inserterSearch	7.42 ms +15.63% -3.23%	7.44 ms +8.87% -4.7%	-0.27%
loadPatterns	549.29 ms +2.29% -4.27%	546.75 ms +2.51% -2.6%	0.46%
wpTotal	365.98 ms +7.07% -6.99%	376.64 ms +1.89% -2%	-2.83%
wpMemoryUsage	13.13 MB +0% -0%	13.10 MB +0% -0%	0.22%
wpDbQueries	54 +0% -0%	54 +0% -0%	0%

site-editor

Metric	901e8ef	trunk	% Change
serverResponse	531.46 ms +3.66% -5.56%	525.46 ms +3.27% -2.99%	1.14%
firstPaint	300.03 ms +40.46% -10.53%	248.74 ms +3.71% -5.54%	20.62%
domContentLoaded	1385.08 ms +2.21% -0.4%	1374.21 ms +0.61% -0.9%	0.79%
loaded	1386.38 ms +2.2% -0.4%	1375.34 ms +0.61% -0.89%	0.8%
firstContentfulPaint	439.44 ms +0.27% -0.64%	428.77 ms +0.67% -1.95%	2.49%
firstBlock	4390.17 ms +0.62% -0.22%	4357.92 ms +0.63% -0.1%	0.74%
type	19.79 ms +17.89% -10.61%	19.75 ms +19.75% -19.39%	0.2%
navigate	105.49 ms +4.19% -6.95%	97.89 ms +11.67% -5.61%	7.76%
loadPatterns	1434.05 ms +5.28% -1.14%	1482.52 ms +7.7% -12.26%	-3.27%
loadPages	1295.32 ms +22.1% -7.51%	1181.88 ms +5.14% -2.42%	9.6%
wpTotal	522.06 ms +3.77% -5.71%	516.16 ms +3.22% -3.14%	1.14%
wpMemoryUsage	12.09 MB +0% -0%	11.99 MB +0% -0%	0.85%
wpDbQueries	43 +2.33% -0%	43 +2.33% -0%	0%

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📝 Walkthrough

Walkthrough

The writing flow now provides one accessible canvas focus stop, restores focus with Enter, preserves selection during Escape navigation, and handles automatic-change undo in a dedicated hook. Styles and end-to-end tests cover the new behavior.

Changes

Writing-flow navigation

Layer / File(s)	Summary
Automatic-change undo integration packages/block-editor/src/components/writing-flow/use-undo-automatic-change.js, packages/block-editor/src/components/writing-flow/index.jsx, packages/block-editor/src/components/rich-text/event-listeners/index.js	Automatic Backspace and Escape undo handling moved into the writing-flow hook. The hook runs before canvas navigation and cleans up its listener.
Canvas focus-stop behavior packages/block-editor/src/components/writing-flow/use-tab-nav.jsx, packages/block-editor/src/components/writing-flow/style.scss, packages/block-editor/src/style.scss	The editor canvas becomes a single accessible tab stop. Enter restores focus to selected or previously focused content. Escape, reverse navigation, IME handling, labels, hints, and focus indicators are updated.
Keyboard navigation validation test/e2e/specs/editor/blocks/{list,math}.spec.js, test/e2e/specs/editor/various/{format-library/math,keyboard-navigable-blocks,multi-block-selection,navigable-toolbar,rich-text,toolbar-roving-tabindex}.spec.js	End-to-end tests cover canvas traversal, focus restoration, selection preservation, Escape handling, and related toolbar and rich-text flows.
Updated editor control locators test/e2e/specs/editor/blocks/buttons.spec.js, test/e2e/specs/site-editor/navigation.spec.js, test/e2e/specs/widgets/customizing-widgets.spec.js	Tests target the updated accessible names for link editing, code editing, and the site-editor Edit control.

Estimated code review effort: 4 (Complex) | ~45 minutes

Merge Risk: ⚪ Minimal · up to 46961

Canvas keyboard navigation adds an accessible focus stop and restores editor focus on re-entry. No current merge-blocking risk remains.

Sequence Diagram(s)

sequenceDiagram
  participant Editor
  participant CanvasStop
  participant WritingFlow
  participant BlockContent
  Editor->>CanvasStop: Tab or Shift+Tab
  CanvasStop->>WritingFlow: Enter
  WritingFlow->>BlockContent: Restore selection or previous focus
  BlockContent-->>Editor: Focus returns to editor content

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Title check	✅ Passed	The title clearly summarizes the main change: keyboard navigation now lets users leave and re-enter the editor canvas with Escape and Enter.

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⚠️ Outside diff range comments (1)

packages/block-editor/src/components/writing-flow/use-tab-nav.jsx (1)

97-100: 🎯 Functional Correctness | 🟠 Major | ⚡ Quick win

Focus the canvas when no tabbable child exists.

If getSelectedBlockClientId() is false and focus.tabbable.find( containerRef.current ) returns an empty list, enterCanvas() focuses the window and then returns without focusing an element. Because the stop handler already calls preventDefault(), Enter, Space, F2, or Escape leaves focus on the canvas stop. Add a fallback that focuses containerRef.current.

Proposed fix

 		if ( tabbables.length ) {
 			tabbables[ 0 ].focus();
+		} else {
+			containerRef.current.focus();
 		}

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In `@packages/block-editor/src/components/writing-flow/use-tab-nav.jsx` around
lines 97 - 100, Update the enterCanvas focus logic to focus containerRef.current
when focus.tabbable.find(containerRef.current) returns no tabbable elements,
while preserving focus on the first tabbable child when one exists.

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Outside diff comments:
In `@packages/block-editor/src/components/writing-flow/use-tab-nav.jsx`:
- Around line 97-100: Update the enterCanvas focus logic to focus
containerRef.current when focus.tabbable.find(containerRef.current) returns no
tabbable elements, while preserving focus on the first tabbable child when one
exists.

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