Sorry, correct steps:

1. Go to http://techslides.com/demos/sample-videos/small.webm
2. Open devtools console
3. type: window.performance.timing.domInteractive

Can you provide some more context on what you're using this for?


I'm not sure if this violates the spec or not.

From the spec: https://www.w3.org/TR/html5/syntax.html#the-end
'''
Once the user agent stops parsing the document, the user agent must run the following steps:

Set the current document readiness to "interactive" and the insertion point to undefined.
'''

There isn't really a document to parse in this case...

Domenic, it looks like we never set the document readiness state to "interactive" in the case where we're just showing media.

Any idea if this behavior is spec compliant?

(Reminder to use https://html.spec.whatwg.org/multipage/parsing.html#the-end.)

Per https://html.spec.whatwg.org/multipage/browsing-the-web.html#read-media, "the user agent must act as if it had stopped parsing." So you do need to set it to interactive.

Thanks Domenic!

This should be a one-line change to 

https://cs.chromium.org/chromium/src/third_party/blink/renderer/core/html/media/media_document.cc

Marking P3, as I can't come up with any particularly reasonable use case here, but we probably should fix this at some point.

Max, I've tentatively put this on your plate as a P3.

Yep I can take it. Thanks!

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6f5978f29f4558a212246d53757b518e3acde7d4

commit 6f5978f29f4558a212246d53757b518e3acde7d4
Author: Liquan(Max) Gu <maxlg@chromium.org>
Date: Wed Sep 26 22:08:28 2018

[DomInteractive] Mark Dom interactive to media document and image document

According to the spec (https://html.spec.whatwg.org/multipage/browsing-the-web.html#read-media),
"Then, the user agent must act as if it had stopped parsing", so we mark
DOM-interactive to Media Document when finishes parsing.

Bug:  845385 
Change-Id: I825409e9cf4c8d11f1f9233844492cc3a0bebe9a
Reviewed-on: https://chromium-review.googlesource.com/1239516
Reviewed-by: Timothy Dresser <tdresser@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Liquan (Max) Gǔ <maxlg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594494}
[add] https://crrev.com/6f5978f29f4558a212246d53757b518e3acde7d4/third_party/WebKit/LayoutTests/external/wpt/navigation-timing/dom_interactive_image_document.html
[add] https://crrev.com/6f5978f29f4558a212246d53757b518e3acde7d4/third_party/WebKit/LayoutTests/external/wpt/navigation-timing/dom_interactive_media_document.html
[modify] https://crrev.com/6f5978f29f4558a212246d53757b518e3acde7d4/third_party/blink/renderer/core/dom/raw_data_document_parser.h
[modify] https://crrev.com/6f5978f29f4558a212246d53757b518e3acde7d4/third_party/blink/renderer/core/html/image_document.cc
[modify] https://crrev.com/6f5978f29f4558a212246d53757b518e3acde7d4/third_party/blink/renderer/core/html/image_document_test.cc
[modify] https://crrev.com/6f5978f29f4558a212246d53757b518e3acde7d4/third_party/blink/renderer/core/html/media/html_media_element_test.cc