CSS Support Table

Table of Contents

1. Legend
2. Properties
3. At-rules
4. Values
5. References

Legend

Fully supported: ✔️
Partial support: ⚠️
Broken: ⛑️
Not supported: ❌
Won't be implemented in the near future: ⛔
Partial support because of accessibility: ♿
Newer values aren't supported yet: 🧨

Properties

Property	Parse	Compute/Lookup	Layout	Paint	Explanation
background	❌	❌	❌	❌	Allows multiple layers of backgrounds, not supported
background-color	✔️	✔️	✔️	✔️
background-image	⚠️	✔️	✔️	⚠️	Gradients aren't supported
background-image	⚠️	✔️	✔️	⚠️	Gradients aren't supported
border	✔️	✔️	✔️	✔️
border-color	✔️	✔️	✔️	✔️
border-width	✔️	✔️	✔️	✔️
border-style	⚠️	✔️	✔️	⚠️	Only none and solid
border-bottom	✔️	✔️	✔️	✔️
border-left	✔️	✔️	✔️	✔️
border-right	✔️	✔️	✔️	✔️
border-top	✔️	✔️	✔️	✔️
color	✔️	✔️	✔️	✔️
cursor	⚠️	✔️	✔️	✔️	URL cursor images are not supported
font	⚠️	⚠️	✔️	⚠️	Not all values are supported
font-family	✔️	⚠️	✔️	✔️	Doesn't lookup certain named fonts (such as emoji) and doesn't support external fonts
font-kerning	✔️	✔️	✔️	✔️
font-size	⚠️️	⚠️	✔️	✔️	Percentage font sizes are not yet supported
font-stretch	✔️	❌	✔️	❌	Not honored
font-style	✔️	✔️	✔️	✔️	Note: fonts can be synthesized, but aren't at the moment.
font-variant-caps	✔️	⚠️	✔️	✔️	Supported at font-level, but some should be emulated for backwards-compatibiliy with CSS 2.1 if the feature isn't supported by the given font
font-variant-east-asian	✔️	✔️	✔️	✔️
font-variant-ligatures	✔️	✔️	✔️	✔️
font-variant-position	✔️	✔️	✔️	✔️
font-weight	✔️	⚠️	✔️	✔️
height	⚠️	✔️	⚠️	✔️	Formatting Contexts don't properly use this value, and fit-content etc. aren't supported
margin	✔️	✔️	⚠️	✔️	Shouldn't apply (fully) to display: inline boxes
margin-bottom	✔️	✔️	⚠️	✔️	Shouldn't apply (fully) to display: inline boxes
margin-block	✔️	✔️	⚠️	✔️	Doesn't use the writing-mode, direction, etc.
margin-inline	✔️	✔️	⚠️	✔️	Doesn't use the writing-mode, direction, etc.
margin-left	✔️	✔️	✔️	✔️
margin-right	✔️	✔️	✔️	✔️
margin-top	✔️	✔️	✔️	✔️
padding	✔️	✔️	✔️	✔️
padding-bottom	✔️	✔️	✔️	✔️
padding-left	✔️	✔️	✔️	✔️
padding-right	✔️	✔️	✔️	✔️
padding-top	✔️	✔️	✔️	✔️
text-decoration	✔️	✔️	✔️	⚠️	See individual properties below
text-decoration-color	✔️	✔️	✔️	✔️
text-decoration-line	✔️	✔️	✔️	🧨 ♿	blink, spelling-error, grammar-error not supported
text-decoration-style	✔️	✔️	✔️	❌	Not honored
text-decoration-skip-ink	❌	❌	❌	❌
text-transform	✔️	✔️	⚠️	✔️	full-width and full-size-kana aren't supported, only Dutch IJ diagraph supported as capitalization edge-case, which might be incorrect.
width	⚠️	✔️	✔️	✔️	Formatting Contexts don't properly use this value, and fit-content etc. aren't supported
white-space	✔️	✔️	⚠️	✔️	pre isn't used properly

At-rules

Name	Parsing	Computation	Explanation
@animation	❌	❌
@charset	✔️	✔️
@import	❌	❌
@font-face	✔️	⚠️	Mostly supported, just unicode-ranges is not correctly used
@media	⚠️	✔️	Only all, screen and print media-types are supported
@namespace	⛔	⛔	This aplies primarily to XML, which will probably not be implemented at all, there are certainly other features that have more priority

Values

Value	Parsing	Compute	Explanation
<angle>	❌	❌	Not supported
<color>	⚠️	⚠️	System colors, e.g. ActiveColor aren't supported
<frequency>	❌	❌	Not supported
Global values	❌	❌	Not supported
<image>	⚠️	⚠️	Gradients aren't supported
<length>	⚠️	⚠️	Newer sizes aren't supported such as ch and dvs
Mathematical Expressions	❌	❌	Not supported
<percentage>	✔️	✔️
<position>	❌	❌	Not supported
<ratio>	❌	❌	Not supported
<resolution>	❌	❌	Not supported
<string>	✔️	✔️
<url>	✔️	✔️	<bad-url> is currently ignored, should anything be done with it?
var(...)	❌	❌	Not supported

References

• CSS Color Module Level 5
• CSS Values and Units Module Level 4