816898 - stop-opacity: applies to graphical element, not fill only.

Status: RESOLVED INVALID

(Core :: SVG, defect)

Description

[jonathan chetwynd]

The current Mozilla implementation applies opacity to the fill layer only,
whereas Opera & Webkit apply to graphical element.

Example set opacity="1" and stop-opacity="0",
Result Mozilla: layers behind graphical element are not visible 
Result Opera Webkit: layers behind graphical element are visible 

see attachment

One could mimic current Mozilla practice with opaque layer behind,
whereas afaict there is no way to mimic Opera/Webkit using Mozilla.
for this reason I don't feel there is a need to take to SVGWG:
http://www.w3.org/TR/SVG11/pservers.html#StopOpacityProperty

However this can easily be done if necessary.

Comment 1

[jonathan chetwynd]

Attachment: reduced testcase

Comment 2

[Alex]

If I change the percentage values to numbers, then it renders the same in Firefox as it does in Safari.

Are percentages allowed for stop-opacity? At the least WebKit and Gecko handle them differently.

Comment 3

[Jonathan Watt [:jwatt]]

For the historical record, <opacity-value> is documented here, and only <number>s are allowed:

http://www.w3.org/TR/SVG11/masking.html#OpacityProperty