Bug 219978 – SVG foreignObject content (seemingly) doesn't get the transform from ancestry tree

• Status: NEW
• Component: SVG

[Bogdan Brinza]

Created attachment 416393 [details]
Minimal reduction

Original site issue found on UniFi controller topology map (https://demo.ui.com/manage/site/default/maps/topology - this demo page takes forever to load in Safari btw, instant in Firefox).

Device icons are basically fixed size as you zoom and move around. There is a zoom level where they look good, every other zoom level breaks them.

I'm attaching a minimal reduction that demonstrates the issue - unifi.html and two image Safari-broken.png and Firefox-working.png (it also works in Chromium FWIW).

Looking at the minimal repro almost everything seems like a red herring, the actually important things are:

<g transform="translate(50,50) scale(0.5)"> - a node with a transform in the ancestry chain

<foreignObject width="48" height="48" x="-24" y="-24"> - foreignObject with a specified size 48x48

Observing the result in Safari and Firefox one can notice that both foreignObjects are twice as large in Safari. (Twice as large and 0.5 scale, hmmmmm :-))

To confirm this I've added another CSS rule that applies scale(0.5) directly to the foreignObject first child nodes (see xforeignObject) - if one removes "x" to make a valid rule and reloads in Safari - the rendering will be identical to Firefox.

[Bogdan Brinza]

Created attachment 416394 [details]
Safari issue

[Bogdan Brinza]

Created attachment 416395 [details]
Firefox reference

[Bogdan Brinza]

Created attachment 416396 [details]
Safari with a scale applied to foreignObject content

[Bogdan Brinza]

Created attachment 416399 [details]
Minimal reduction

[Bogdan Brinza]

Created attachment 416422 [details]
Minimal reduction

Based on my earlier notes, I've removed everything irrelevant to demonstrate the problem even more clearly

[Smoley]

Thanks for filing, I can reproduce this on Safari 13.1.3 as well as STP 117.

[Radar WebKit Bug Importer]

<rdar://problem/72596144>