Hiroyuki Ikezoe (:hiro) Reporter
	Description • 7 years ago

From the spec [1];

 none
     The pseudo-element is not generated.

Stylo does not pseudo elements at all.

[1] https://www.w3.org/TR/CSS21/generate.html#content

	Hiroyuki Ikezoe (:hiro) Reporter
	Comment 1 • 7 years ago

https://treeherder.mozilla.org/#/jobs?repo=try&revision=539ae2c3258394e9c6aa7f73a30dfb5a763ba22a
I have no idea how to test this without checking whether animation was created on the pseudo element which has 'content:none'.

	Chris Peterson [:cpeterson]
	Comment 2 • 7 years ago

Hiro, is this a bug we need to fix in Stylo? Or a bug in Gecko's style system?

	Hiroyuki Ikezoe (:hiro) Reporter
	Comment 3 • 7 years ago

Tight, this is a gecko bug, stylo handles the case correctly.

	Chris Mills [:cmills]
	Comment 4 • 7 years ago

Marking as part of documentation plan for intentional stylo differences, just in case this is fixed before stylo hits release.

	Chris Mills [:cmills]
	Comment 5 • 7 years ago

Documented:

https://developer.mozilla.org/en-US/docs/Web/CSS/::before#Quantum_CSS_notes
https://developer.mozilla.org/en-US/docs/Web/CSS/::after#Quantum_CSS_notes
https://developer.mozilla.org/en-US/docs/Web/CSS/content#Quantum_CSS_notes
https://developer.mozilla.org/en-US/Firefox/Releases/57#Quantum_CSS_notes

	Hiroyuki Ikezoe (:hiro) Reporter
	Comment 6 • 6 years ago

Closing since this is a bug for the old style system.