Smooth animation, WebGL, and other things should work correctly embedded in a <portal> element, and should render smoothly and efficiently.
The following revision refers to this bug: https://chromium.googlesource.com/chromium/src.git/+/06548fb143b21d1ef09cd40509a860b262907ad8 commit 06548fb143b21d1ef09cd40509a860b262907ad8 Author: Lucas Furukawa Gadani <lfg@chromium.org> Date: Tue Jan 15 05:01:25 2019 Portals: Add support for compositing portals. Bug: 914109 Change-Id: I8ebdfe2352f4a914ca1f2541380c4eafa6a03ab2 Reviewed-on: https://chromium-review.googlesource.com/c/1394985 Reviewed-by: Charlie Reis <creis@chromium.org> Reviewed-by: Jeremy Roman <jbroman@chromium.org> Reviewed-by: Ken Buchanan <kenrb@chromium.org> Commit-Queue: Lucas Gadani <lfg@chromium.org> Cr-Commit-Position: refs/heads/master@{#622737} [modify] https://crrev.com/06548fb143b21d1ef09cd40509a860b262907ad8/content/browser/portal/portal.cc [modify] https://crrev.com/06548fb143b21d1ef09cd40509a860b262907ad8/content/browser/web_contents/web_contents_impl.cc [modify] https://crrev.com/06548fb143b21d1ef09cd40509a860b262907ad8/content/shell/browser/shell.cc [modify] https://crrev.com/06548fb143b21d1ef09cd40509a860b262907ad8/content/shell/browser/shell.h [modify] https://crrev.com/06548fb143b21d1ef09cd40509a860b262907ad8/third_party/blink/renderer/core/frame/local_frame_view.cc [modify] https://crrev.com/06548fb143b21d1ef09cd40509a860b262907ad8/third_party/blink/renderer/core/frame/remote_frame_view.cc [modify] https://crrev.com/06548fb143b21d1ef09cd40509a860b262907ad8/third_party/blink/renderer/core/frame/remote_frame_view.h [modify] https://crrev.com/06548fb143b21d1ef09cd40509a860b262907ad8/third_party/blink/renderer/core/html/portal/document_portals.h [modify] https://crrev.com/06548fb143b21d1ef09cd40509a860b262907ad8/third_party/blink/renderer/core/html/portal/html_portal_element.cc [modify] https://crrev.com/06548fb143b21d1ef09cd40509a860b262907ad8/third_party/blink/renderer/core/html/portal/html_portal_element.h [add] https://crrev.com/06548fb143b21d1ef09cd40509a860b262907ad8/third_party/blink/web_tests/external/wpt/portals/portals-rendering.html [add] https://crrev.com/06548fb143b21d1ef09cd40509a860b262907ad8/third_party/blink/web_tests/external/wpt/portals/references/portals-rendering.html [add] https://crrev.com/06548fb143b21d1ef09cd40509a860b262907ad8/third_party/blink/web_tests/external/wpt/portals/resources/portals-rendering-portal.html
Comment 1 by jbroman@chromium.org
, Dec 11