145419 - dynamically added ::first-letter and ::first-line rules not applied

Status: NEW

(Core :: CSS Parsing and Computation, defect, P3)

Description

[Daniel Dawson]

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0rc1) Gecko/20020417
BuildID:    2002041711

If an alternate stylesheet specifies a rule using the :first-letter or
:first-line pseudo-element, but no rule in the default stylesheet matches the
same pseudo, the former rule is ignored for that element.

For instance, if the default stylesheet says the first letter of a given
paragraph should be green, and the alternate stylesheet says red, both are
honored, but if the "green" rule is missing, both are rendered using the
inherited value.


Reproducible: Always
Steps to Reproduce:
1. View any page that does not specify a style rule for a given
:first-letter or :first-line pseudo-element in its default stylesheet but does
specify such a rule in an alternate stylesheet
2. Use the View > Use Style menu to switch to the alternate stylesheet


Actual Results:  The rule in the alternate stylesheet is ignored.

Expected Results:  The rule in the alternate stylesheet should be applied; the
default stylesheet should not affect alternate stylesheets.

Comment 1

[Daniel Dawson]

Attachment: HTML file linking to default and alternate stylesheets

Comment 2

[Daniel Dawson]

Attachment: Default stylesheet (version 1) for attachment 84145

(Re)name to default.css to test.

Comment 3

[Daniel Dawson]

Attachment: Default stylesheet (version 2) for attachment 84145

(Re)name to default.css to test.

Comment 4

[Daniel Dawson]

Attachment: Alternate stylesheet for attachment 84145

Name it alternate.css to test.

Comment 5

[John P Baker]

This looks remarkably like bug 126072 although that is
about :before and :after pseudo classes

Comment 6

[Daniel Dawson]

Hmm. Not only are they remarkably alike, it looks like they're one and the same.
(Both caused by a general problem with pseudo-elements.) Would it be appropriate
to call this a dup?

Comment 7

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

No.

Comment 8

[Madhur Bhatia]

Attachment: testcase with correct links to the style sheets

this testcase uses 
- attachment 84146 [details] for default-1 stylesheet
- attachment 84147 [details] for default-2 stylesheet
- attachment 84148 [details] for Alternate stylesheet

Comment 9

[Madhur Bhatia]

I see the bug on linux, win2000 and macOS 9.1.

Confirming the bug.

Repeating reporter's comment : 
"If an alternate stylesheet specifies a rule using the :first-letter or
:first-line pseudo-element, but no rule in the default stylesheet matches the
same pseudo, the former rule is ignored for that element."

Comment 10

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

This may be the same problem as bug 23604.

Comment 12

[haelwenn.monnier]

When inverting Default-1 and Default-2 it works fine. Maybe It’s because it wasn’t defined before…