Bug 283474 – background-size near with near zero values fails

• Component: CSS
• Status: NEW

[Karl Dubost]

Go to http://wpt.live/css/css-backgrounds/background-size/background-size-near-zero-png.html
You should see a green square like in Firefox and Chrome.


Safari: Green Square visible
<div style="background-image: url(support/50x50-green.png); width: 100px; height: 100px; background-size: 0.3px 0.3px;"></div>

Safari: Green Square NOT visible
<div style="background-image: url(support/50x50-green.png); width: 100px; height: 100px; background-size: 0.2px 0.2px;"></div>


The floor value seems to be 

0.249999992px FAIL
0.249999993px PASS


inline const LengthSize& RenderStyle::backgroundSizeLength() const { return backgroundLayers().sizeLength(); }
https://searchfox.org/wubkat/rev/d45649fa32a499702c30474e94bd6843c4c67849/Source/WebCore/rendering/style/RenderStyleInlines.h#97

[Karl Dubost]

Created attachment 473304 [details]
rendering in safari, firefox, chrome

Safari Technology Preview  207           20621.1.4.3
Firefox Nightly            134.0a1       13424.11.8
Google Chrome Canary       133.0.6849.0  6849.0

[Karl Dubost]

fwiw:

The minimal value for other browsers are


Firefox: 
FAIL: 0.008333332px
PASS: 0.008333333px

Chrome:
FAIL: 0.0078124997px
PASS: 0.0078124998px

[Karl Dubost]

The minimal value for Safari is probably too high.

[Radar WebKit Bug Importer]

<rdar://problem/140387662>