[css-ui] The interactivity property should not be included in the all shorthand

[lilles]

The spec does not currently say, but including interactivity in all seems unfortunate:

<style>
  #inert {
    interactivity: inert;
  }
  #child {
    all: initial;
  }
</style>
<div id="inert">
  <span id="child"></span>
</div>

@flackr @mfreed7

[tabatkins]

I could see this fitting in the same category as 'direction' and 'unicode-bidi' and getting excluded, yeah.

[Loirooriol]

I don't really see what's special about interactivity... Seems this should be analogous to the following, where the text is visible:

<style>
  #invisible {
    visibility: hidden;
  }
  #child {
    all: initial;
  }
</style>
<div id="invisible">
  <span id="child">Some text</span>
</div>

This issue seems to originate from https://issues.chromium.org/issues/408241037, where it was reported that all: initial can now escape the inertness established by the inert attribute.

I haven't been following the latest inert discussions in detail, but arguably that should be addressed by rejecting whatwg/html#10956. I.e. instead of saying that the inert attribute sets interactivity: inert, it should make the UA treat interactivity: auto as inert.