Contact emailsdizha...@chromium.org Specificationhttps://w3c.github.io/selection-api/#dom-selection-iscollapsed
Summary Selection isCollapsed should return true if and only if the anchor and focus are the same. This should be true whether the selection starts/ends inside a light or a shadow tree. Currently, the chromium implementation returns true if selection's anchor node is in a shadow tree, even if the selection itself is not collapsed. We fix this by removing the erroneous shadow tree check. Blink componentBlink>DOM>ShadowDOM <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EDOM%3EShadowDOM> TAG reviewNone TAG review statusNot applicable Risks Interoperability and Compatibility This matches the standards definition of a collapsed selection. This matches Firefox/Gecko's implementation. Safari/Webkit still has this bug. Because Selection in and across shadow trees is not well supported yet, this bug has been in the code for a long time. We added a use counter to check how often the result for selection.isCollapsed will differ due to this shadow tree check (called SelectionIsCollapsedBehaviorChange). Currently, Selection::isCollapsed is high usage at 3% of all page loads [1]. On the other hand, the SelectionIsCollapsedBehaviorChange feature change is currently at a low usage of 0.001% of all page loads [2]. Overall, since the change usage is low and we are making this change to fix a bug with clear specification text, the compatibility risk is low. [1] https://chromestatus.com/metrics/feature/timeline/popularity/1001 [2] https://chromestatus.com/metrics/feature/timeline/popularity/5101 *Gecko*: Shipped/Shipping *WebKit*: No signal Webkit has this bug, since this has existed for a long time. *Web developers*: No signals *Other signals*: Ergonomics There are no other APIs that this feature will used in tandem with. Activation It should not be challenging for developers to take advantage of this feature immediately. Security There are no security risks for this feature. WebView application risks Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications? None Debuggability DevTools support for this feature is not needed. Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, ChromeOS, Android, and Android WebView)?Yes All platforms support DOM selection. Is this feature fully tested by web-platform-tests <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md> ?Yes https://wpt.fyi/results/selection/shadow-dom/tentative/Selection-isCollapsed.html?label=experimental&label=master&aligned Flag name on chrome://flagsSelectionIsCollapsedShadowDOMSupport Finch feature nameNone Non-finch justification This is a long term bug fix and is a no developer-visible change. Requires code in //chrome?False Tracking bughttps://issues.chromium.org/issues/40400558 Sample links https://codepen.io/Di-Zhang/pen/jOjdeoX Estimated milestones Shipping on desktop 131 Shipping on Android 131 Shipping on WebView 131 Anticipated spec changes Open questions about a feature may be a source of future web compat or interop issues. Please list open issues (e.g. links to known github issues in the project for the feature specification) whose resolution may introduce web compat/interop risk (e.g., changing to naming or structure of the API in a non-backward-compatible way). None Link to entry on the Chrome Platform Status https://chromestatus.com/feature/5175599392620544?gate=5084420995022848 This intent message was generated by Chrome Platform Status <https://chromestatus.com/>. -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to blink-dev+unsubscr...@chromium.org. To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CA%2BSS7eCxjhuVojPQe%2BFekbsR%2B8ttnGa2_9FbGM-t3uJPmS51Og%40mail.gmail.com.
