Intent to Ship (Nightly Only) : Dialog Element
Hi All,
In bug 1645046 <https://bugzilla.mozilla.org/show_bug.cgi?id=1645046>, I
intend to turn html5 <dialog> element on by default in Nightly. It has
been developed behind the dom.dialog_element.enabled preference.
Meta Tracking Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=840640
This is Nightly only because two things needs adjustment in our
implementation.
1. The inert element isn't supported (bug 921504 -
https://bugzilla.mozilla.org/show_bug.cgi?id=921504).
- For modal dialog, elements that are not part the dialog should be
mark as inert, so these elements gain the inert-ness and can't be
focused. Since we don't have inert supported yet, users could use tab to
move focus out of the dialog, which is not expected.
- Next Step: The implementation of inert element is going to be
started soon (I think), and we can also discuss to support the
inert-ness without the supporting of inert element
2. We currently use a temporary solution for the layout of modal dialog.
(bug 1637310 - https://bugzilla.mozilla.org/show_bug.cgi?id=1637310).
- Currently the spec defines modal dialog as an absolute element,
along with some weird calculation requirement to make the element
centered. This modal dialog layout felt like a hack to us, so we didn't
follow it, and instead, we used a temporary solution
(https://bugzilla.mozilla.org/show_bug.cgi?id=1642364) to make the modal
dialog as a centered fixed element.
- Next Step: The CCSWG agreed to switch modal dialog to be a centered
fixed element
(https://github.com/w3c/csswg-drafts/issues/4645#issuecomment-642130060),
which is the same as the temporary solution we applied in bug 1642364.
So the temporary solution may become a permanent solution after things
have been finalized in spec.
*Status in other browsers*
Chrome has it enabled by default since Release 37
https://www.chromestatus.com/feature/5770237022568448
*web-platform-tests*:
https://github.com/web-platform-tests/wpt/tree/master/html/semantics/interactive-elements/the-dialog-element,
We have them all enabled and passing except for those layout and inert
related ones.
*Spec* - https://html.spec.whatwg.org/multipage/#the-dialog-element
This feature was previously discussed in
https://groups.google.com/d/msg/mozilla.dev.platform/vTPGW1aJq24/JnEnoH3BEAAJ
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