Intent to ship screen and viewport options for vector-effect

[Robert Longson]

Summary: vector-effect: non-scaling-stroke is supposed to support an additional optional argument that can be either viewport or screen. I.e.

vector-effect: non-scaling-stroke viewport;

vector-effect: non-scaling-stroke screen;

vector-effect: non-scaling-stroke should be the same as vector-effect: non-scaling-stroke viewport

These options differ in the presence of nested <svg> elements.  Viewport uses the nearest ancestor <svg> element, screen uses all ancestor <svg> elements to determine the scaling to cancel.

Prior to Firefox 128 our implementation was incorrect but more closely matched screen than viewport. Implementing the screen option will offer users an option that more closely matches the functionality of Firefox < 128 if they still need that.

Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1904891

Specification: https://www.w3.org/TR/SVG2/coords.html#VectorEffects

Standards body: w3c

[Sebastian Zartner]

For anyone wondering, the linked bug in Robert's mail is different from the link text.

So here is it again: https://bugzilla.mozilla.org/show_bug.cgi?id=1904891

Sebastian

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[Robert Longson]

In the end we decided not to implement screen or viewport support as we found an addendum to the SVG spec that removes them.