[Popup] If a fragment anchor is located inside a popup, should it open upon navigation?

[mfreed7]

For example, here:

<popup id=foo>
   <div id=bar>Hello</div>
</popup>

Should navigating to the #foo or #bar fragments automatically open the popup?

With that behavior, some of the use cases listed in #311 could be declaratively achieved, without needing an open attribute.

Some corner cases that might be interesting:

<popup id=p></popup>
<button popup=p id=anchor></button>

==> should navigating to #anchor open the popup?

<popup>
  <popup>
    <span id=anchor></span>
  </popup>
</popup>

==> should only the innermost popup be shown? The issue here is that it won't be visible - it is nested inside another non-shown <popup>, which is display:none.

I think the popup stack behavior is pretty clear in this case: navigating to a fragment anchor like this should behave as if .show() was called on the relevant popup. So if there's already another popup showing when the navigation happens, the existing popup is closed.

@flackr @mirisuzanne @stubbornella

[mirisuzanne]

This use-case came up in a conversation about popups, and I think that's useful. I can imagine linking to a specific menu-item, for example. But I think the pattern becomes even more useful when applied to more persistent elements like a dialog or details.

[mfreed7]

Another similar issue, which might deserve its own issue, was brought up at today's OpenUI meeting: should Find in Page be able to discover the content of a hidden <popup>? And should Find in Page be able to show the popup when that entry is selected by Find in Page?

Similar issues are being tackled for <summary>/<details>, via content visibility, so perhaps there's some overlap here. @josepharhar @chrishtr @tantek

[hidde]

I agree with @mirisuzanne and think it is useful for popups, dialog and details/summary.

An example in the wild: on the WAI Website we have a script that checks if the URL has a fragment identifier and opens the relevant details element, as we found people would want to see that opened if they link to it (example: fragment link where anchor is inside details). Would be nice is this was platform behavior.

[mfreed7]

I think this issue is fully covered/subsumed by #344. I'm going to close this one.