1106296 - Update `:empty` to also match whitespace‑only elements (like `:-moz-only-whitespace`)

Status: ASSIGNED

(Core :: CSS Parsing and Computation, enhancement)

Description

[sjw]

We already have :-moz-only-whitespace and we should also support the standardized pseudo-class :blank.
At the moment it's not sure, if :blank will be the final name.

Comment 1

[yiorsi]

Demo:

http://jsbin.com/xivoxowuse/edit?html,css,output

Comment 2

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

Today the group resolved to drop :blank and change :empty to be like :blank, although I'm skeptical that this will be Web-compatible.  We should do this after Blink does it, but I don't think it's worth risking Web compat on before they move first.

Comment 3

[ExE Boss]

We should probably do this sooner, rather than later, as `:blank` is now documented on MDN with support for `:‑moz‑only‑whitespace` being documented in the browser compatibility table.

https://developer.mozilla.org/docs/Web/CSS/:blank
https://github.com/mdn/browser-compat-data/pull/2841
https://github.com/mdn/data/pull/298

Comment 4

[David Shin[:dshin]]

Attachment: Bug 1106296: Change :empty to consider whitespace to be insignificant. r=#layout-reviewers

This merges -moz-only-whitespace, which had this behaviour already, into empty.

Comment 5

[Jonathan Kew [:jfkthame]]

Looking through https://github.com/w3c/csswg-drafts/issues/1967, it's not clear to me that there's any firm agreement on this.... has there been recent discussion, beyond what's in that issue? What's the status in other browsers?

Comment 6

[David Shin[:dshin]]

Hmm... you're right. Should've gone through all the link before trying to follow the spec.
No other browsers currently do this.
I'll shelve the change and contribute to that discussion.