Currently, the only ways to handle the diverse range of text input
methods out there (IME composition, Emoji picker, handwriting
recognition, etc.) are <input>, <textarea>, and contenteditable
elements, which are not very customizable. Because of this, many text
editors on the web resort to using a hidden editable element to handle
text input and a canvas to render the text. This requires keeping the
contents and position of the hidden element in sync with the canvas so
that text input UI is rendered properly, which is cumbersome for
developers, and can lead to webcompat bugs due to differences in text
input between browsers. The EditContext API gives developers full
control over the text input process, so that they can create custom
editors with fewer difficulties and limitations.
EditContexts can be attached to either an ordinary DOM element (in which
case the text rendering and selection are handled by the browser) or a
<canvas> (in which case these are handled by the web developer). We plan
to begin by only shipping the DOM-based EditContext, since there are
more accessibility concerns with canvas-based EditContext (see
discussion here
<https://github.com/mozilla/standards-positions/issues/199>).
See also: EditContext explainer
<https://github.com/w3c/edit-context/blob/gh-pages/explainer.md>
Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1904161
<https://bugzilla.mozilla.org/show_bug.cgi?id=1904161>
Specification: https://w3c.github.io/edit-context/
<https://w3c.github.io/edit-context/>
Standards Body: W3C
Platform Coverage: All
Preference: dom.editcontext.enabled
DevTools Bug: N/A
Extensions Bug: N/A
Use Counter: editcontext_constructor
Standards-Positions
Discussion:https://github.com/mozilla/standards-positions/issues/199
<https://github.com/mozilla/standards-positions/issues/199>
Other Browsers:
*
Blink: Shipped in 121
*
WebKit: Considering
(https://github.com/WebKit/standards-positions/issues/243
<https://github.com/WebKit/standards-positions/issues/243>)
web-platform-tests:https://github.com/web-platform-tests/wpt/tree/master/editing/edit-context
<https://github.com/web-platform-tests/wpt/tree/master/editing/edit-context>
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