[draft] Spell check custom dictionary#12590
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Introduces a per-document custom spelling exemption list that allows pages (in a SecureContext) to add or remove words from the UA's spell checker so those words are not flagged as misspelled. - Defines the `concept-custom-spelling-exemptions` ordered set on each Document - Adds the `SpellCheckCustomDictionary` interface with `addWords()` and `removeWords()` - Exposes `window.spellCheckDictionary` [SecureContext, SameObject] - Specifies that UAs without spell checking support must not expose the attribute, preserving `if (window.spellCheckDictionary)` as a reliable feature-detection pattern Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Introduces a per-document custom spelling exemption list that allows pages (in a SecureContext) to add or remove words from the UA's spell checker so those words are not flagged as misspelled. - Defines the `concept-custom-spelling-exemptions` ordered set on each Document - Adds the `SpellCheckCustomDictionary` interface with `addWords()` and `removeWords()` - Exposes `window.spellCheckDictionary` as `[SecureContext, SameObject]` on Window - Matching is case-sensitive, since the primary use cases are proper nouns, brand names, and acronyms where casing is part of the word's identity - Specifies that UAs without spell checking support must not expose the attribute, preserving `if (window.spellCheckDictionary)` as a reliable feature-detection pattern Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
bkardell
marked this pull request as draft
June 17, 2026 09:07
annevk
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cc @whatwg/i18n @whatwg/a11y |
This was referenced Jun 17, 2026
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Chromium implementation bug: https://issues.chromium.org/issues/428005649 |
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on first reading, I don't have any accessibility concerns with this |
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Add initial draft for supporting spell check custom dictionary (currently stage 1)
(See WHATWG Working Mode: Changes for more details.)
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