Summary: This is an enhancement to the IntersectionObserver API.
Currently, it is possible to use the top level document (implicit root)
or to specify an Element (e.g. {root: document.scrollingElement}). None
of these options provides a way to specify a root corresponding to the
bounding box of an iframe's window. This proposal is about allowing an
explicit Document root, in order to cover that case.Original intent-to thread: https://groups.google.com/forum/#!searchin/mozilla.dev.platform/intersectionobserver/mozilla.dev.platform/YdKTMvQygl0/cl2vdYt3BgAJ Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1617154 https://bugzilla.mozilla.org/show_bug.cgi?id=1381574 (meta bug) Standard: https://w3c.github.io/IntersectionObserver (specification) https://github.com/w3c/IntersectionObserver/issues/372 (public discussion) Platform coverage: All Preference: dom.IntersectionObserverExplicitDocumentRoot.enabled DevTools bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1617526 https://bugzilla.mozilla.org/show_bug.cgi?id=1347849 Other browsers: * WebKit: intent emailed https://lists.webkit.org/pipermail/webkit-dev/2020-February/031087.html considering https://bugs.webkit.org/show_bug.cgi?id=208047 * Blink: intent emailed https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/6dOOw2vu1is shipped since version 81 https://chromium-review.googlesource.com/c/chromium/src/+/2015676 web-platform-tests: https://w3c-test.org/intersection-observer/document-scrolling-element-root.html Secure contexts: Same as IntersectionObserver Is this feature enabled by default in sandboxed iframes: Same as IntersectionObserver As mentioned in the original intent-to thread, the root can be in a different-origin document so there is some security aspect to consider here. AFAIK, the proposal does not make the situation worse though. I can't find any conclusion on the security aspect in the original intent-to thread, so I guess someone more knowledgeable than me on this should comment. -- Frédéric Wang _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
