Tested in Chrome (headless, --autoplay-policy=no-user-gesture-required):
playing fires on every pause-to-play transition, not just the first
time. The _playing flag was incorrectly suppressing this. Removed it
and updated tests to match verified Chrome behavior.
Per spec, valid type values are absent, empty string, or a
case-insensitive match for "text/css". Also clear cached sheet
when the element is disconnected or type becomes invalid.
Per spec, complete returns true when the image has no src, is fully
fetched, or is broken. Since this is a headless browser that does
not fetch images, complete always returns true.
Per spec, connected style elements with type text/css should
return a CSSStyleSheet object. Previously always returned null.
The sheet is lazily created and cached on first access.
html5ever generally makes guarantees about nodes being parentless when
appending, but we've already seen 1 case where appendCallback receives a
connected node.
We're now seeing something in appendBeforeSiblingCallback, but we have a clearer
picture of how this is happening. In this case, it's via custom element
upgrading and the custom element constructor has already placed the node in
the document.
It's worth pointing, html5ever just has an opaque reference to our node. While
it guarantees that it will give us parent-less nodes, it doesn't actually know
anything about our nodes, or our node._parent. The guarantee is only from its
own point of view. There's nothing stopping us from giving a node a default
parent as soon as html5ever asks us to create a new node, in which case, the
node _will_ have a parent.
Per spec, buffered entries should be delivered via a queued task,
not synchronously. Extract scheduling logic into
schedulePerformanceObserverDelivery() and use it from both
notifyPerformanceObservers and the buffered observe path.
Per MDN, playing fires "after playback is first started, and whenever
it is restarted." A second play() while already playing should be a
no-op. Both play and playing now only fire on the paused -> playing
transition.
- play event only fires when transitioning from paused to playing
- pause event only fires when transitioning from playing to paused
- playing event always fires on play() per spec
- explicitly set bubbles: false, cancelable: false on events
- updated tests to verify no duplicate events on repeated calls
Fetch responses from the network now have their statusText set using
the HTTP status phrase (e.g. "OK", "Not Found"), matching the Fetch
spec and the existing XMLHttpRequest behavior.
