Hi there!
As I understand it, ESR versions has the same core features when it
comes to HTML/CSS engine of their "regular" counterpart versions. For
instance, FF ESR 52.6.0 should match features of FF 58.
However, the implementation of spec "CSS Masking Module Level"
(https://drafts.fxtf.org/css-masking-1/) seems to work in 58 and not in
ESR 52.6.0, at least with the Win32 version.
Is this a regression bug or this "mismatch" is supposed to happen for
some features?
In order to test the issue, check the Example section of the
"mask-image" property:
https://developer.mozilla.org/en-US/docs/Web/CSS/mask-image#Example
If a star appears, it is working. If a green square shows up instead, it
is not.
I've found these related bugs:
- https://bugzilla.mozilla.org/show_bug.cgi?id=686281 (Firefox)
- https://bugzilla.mozilla.org/show_bug.cgi?id=1312613 (Core)
--
*Tiago Marques Delboni*
Gerência de Aplicações e Suporte a Clientes / GTI
(31) 2108-7700
Assembleia Legislativa de Minas Gerais <http://www.almg.gov.br>
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