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= 
<https://bugzilla.mozilla.org/show_bug.cgi?id=1880689>1904891 
<https://bugzilla.mozilla.org/show_bug.cgi?id=1904891>

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

Standards body: w3c

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