1221877 - Incorrect Fallback for the CSS text-shadow Property with an Invalid Color Value

Status: RESOLVED DUPLICATE of bug 1199610

(Core :: CSS Parsing and Computation, defect)

Description

[Patrick Dark]

Attachment: testcase.xhtml

User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:42.0) Gecko/20100101 Firefox/42.0
Build ID: 20151029151421

Steps to reproduce:

Specify the CSS |text-shadow| property with an invalid color value.


Actual results:

Text is rendered with a text shadow as if the |currentcolor| keyword had been specified in the |text-shadow| property declaration.


Expected results:

No text shadow should have been rendered because the color value is invalid; the entire property declaration should have been invalidated. (If there's a valid fallback |text-shadow| declaration, that should be used instead.)

This situation is handled correctly in Google Chrome 46, Microsoft Edge 20, and Microsoft Internet Explorer 11. (I don't have access to Safari.)

This bug means that one can't use CSS4 Color HSL color values utilizing explicit degree (|deg|) units with an equivalent fallback declaration unless the text color is the same as the intended text shadow color.

Comment 1

[Nicolas Silva [:nical]]

A CSS property being rendered somehow while the spec mandates to drop it sounds more like a DOM/style system issue than a low level graphics bug (not sure which component is best for this, so moving to DOM speculatively).
It also reproduces on Linux.

Comment 2

[:Ms2ger (he/him; ⌚ UTC+1/+2)]

Fixed in bug 1199610; will be making its way to release as scheduled.

Comment 3

[Boris Zbarsky [:bzbarsky]]

> Component: DOM → CSS Parsing and Computation

Yep.  For future reference, a CSS property not being dropped when invalid has nothing to do with the DOM.  ;)