Contact emailsvmp...@chromium.org, nrosent...@chromium.org Explainer https://github.com/WICG/view-transitions/blob/main/document-render-blocking.md#blocking-element-id
Specification https://html.spec.whatwg.org/multipage/links.html#link-type-expect Summary This feature enables authors to block rendering of a Document until the critical content has been parsed, ensuring a consistent first paint across all browsers. Without this feature, the first paint's state depends on the heuristics for parser yielding which can vary across browsers. This is particularly important for View Transitions where the parsed DOM state on the first frame can drastically change the transition created. Note that this feature specifically implements a `<link rel=expect href="#id">` syntax that allows a link element to reference another expected element on the page. The rendering is then blocked until the expected element is fully parsed. This supersedes previous implementation of html attribute that allows the whole document to be render blocked. Blink componentBlink>ViewTransitions>MPA <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EViewTransitions%3EMPA> TAG reviewhttps://github.com/w3ctag/design-reviews/issues/886 TAG review statusIssues addressed Risks Interoperability and Compatibility None *Gecko*: Positive (https://github.com/mozilla/standards-positions/issues/875 ) *WebKit*: No signal ( https://github.com/WebKit/standards-positions/issues/245) *Web developers*: Positive (https://github.com/whatwg/html/issues/9332) There are some discussions between implementors and developers on this issue. This feature is also a requisite feature for cross-document View Transition adoption, which has strong positive signals ( https://daverupert.com/2023/05/getting-started-view-transitions/). *Other signals*: Ergonomics This feature would be used frequently with cross-document View Transitions, because it allows the browser to wait for necessary content to be parsed. Activation This feature can be used directly. 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? There are no WebView application risks Debuggability None Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, ChromeOS, Android, and Android WebView)?Yes 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/html/dom/render-blocking?label=master&label=experimental&aligned&q=element-render-blocking Note that we will be renaming these from .tentative shortly Flag name on chrome://flagsNone Finch feature nameDocumentRenderBlocking Requires code in //chrome?False Adoption expectationThis feature is expected to be adopted by developers using cross-document View Transitions Estimated milestones Shipping on desktop 124 Shipping on Android 124 Shipping on WebView 124 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/5113053598711808 Links to previous Intent discussionsIntent to prototype: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAMLuWUzNfD4MRk0bR1yTZ5F6NzcpETrUU3Vy9GmANZRQd7%3DE4A%40mail.gmail.com 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/CADsXd2MZaRt_2k5-Hny9crxJSgZbgEJau0my%3DW9_7-pp0OqKUw%40mail.gmail.com.
