Appendix II: Supported Standard CSS Features


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Item	Limitations	Spec
selectors	only Universal, `#id`, `.class`, `::before`, `::after`, `::first-line`, `::first-letter`	CSS Selectors Level 3 ^[a]
`@font-face` rule	only OTF fonts supported	CSS Fonts Module Level 3 ^[b]
`font-family`
`font-size`
`font-style`
`font-variant-position`
`font-variant-caps`
`font-weight`
`margin(-(top\|right\|bottom\|left))?`		CSS Box Model Module Level 3 ^[c]
`padding(-(top\|right\|bottom\|left))?`		CSS Box Model Module Level 3 ^[c]
`width`, `height`		CSS Box Sizing Module Level 3 ^[d]
`min-width`, `min-height`		CSS Box Sizing Module Level 3 ^[d]
`border(-(top\|right\|bottom\|left))?(-(color\|style\|width))?`		CSS Backgrounds and Borders Module Level 3 ^[e]
`background(-color)?`		CSS Backgrounds and Borders Module Level 3 ^[e]
`color`		CSS Color Module Level 3 ^[f]
`text-align`		CSS Text Module Level 3 ^[g]
`text-indent`
`line-break`
`hyphens`
`white-space`
`counter-reset`		CSS Lists and Counters Module Level 3 ^[h]
`counter-increment`
`list-style(-type)?`
`bookmark-(level\|label\|state)`		CSS Generated Content Module Level 3 ^[i]
`leader()`
`target-counter()`
`target-text()`
^[a]10 Tantek Çelik et. al (2018): Selectors Level 3. W3C Recommendation. Available at https://www.w3.org/TR/selectors-3/ (Accessed May 15, 2025) ^[b]11 John Daggett et. al (2018): CSS Fonts Module Level 3. Available at https://www.w3.org/TR/css-fonts-3/ (Accessed May 15, 2025) ^[c]12 Elika J. Etemad (2024): CSS Box Model Module Level 3. W3C Recommendation. Available at https://www.w3.org/TR/css-box-3/ (Accessed May 15, 2025) ^[d]13 Tab Atkins and Elika J. Etemad (2024): CSS Box Sizing Module Level 3. W3C Working Draft. Available at https://www.w3.org/TR/css-sizing-3/ (Accessed May 15, 2025) ^[e]14 Elika J. Etemad and Brad Kemper (2024): CSS Backgrounds and Borders Module Level 3. W3C Candidate Recommendation Draft. Available at https://www.w3.org/TR/css-backgrounds-3/ (Accessed May 15, 2025) ^[f]15 Tantek Çelik et. al (2018): CSS Color Module Level 3. W3C Recommendation. Available at https://www.w3.org/TR/css-color-3/ (Accessed May 15, 2025) ^[g]16 Elika J. Etemad et. al (2024): CSS Text Module Level 3. W3C Candidate Recommendation Draft. Available at https://www.w3.org/TR/css-text-3/ Accessed May 15, 2025) ^[h]17 Elika J. Etemad and Tab Atkins (2020): CSS Lists and Counters Module Level 3. W3C Working Draft. Available at https://www.w3.org/TR/css-lists-3/ (Accessed May 15, 2025) ^[i]18 Elika J. Etemad and David Cramer (2019): W3C Working Draft. Available at https://www.w3.org/TR/css-content-3/ (Accessed May 15, 2025)