Status

This page documents the implementation status of various HTML and CSS features in Blitz.

CSS PropertiesHTML ElementsEvents

CSS Properties are grouped into logical feature grouping, and within each group they are roughly ordered by the percentage of web pages that use that property. You can generally assume that if the longhand versions of a property are supported then the shorthand version will also be supported and vice-versa.

Core

% usePropertyStatus
93%display
display:inline✅ Supported
display:block✅ Supported
display:inline-block✅ Supported
display:flex✅ Supported
display:grid✅ Supported

Subgrid is not supported

display:table⚠️ Partial support taffy#467

Table layout is emulated with CSS Grid.

display:grid-lanes❌ Not supported taffy#910
display:none✅ Supported
display:contents✅ Supported
92%position
position:static❌ Not supported
position:relative✅ Supported
position:absolute✅ Supported
position:fixed❌ Not supported
position:sticky❌ Not supported

Note that because 'position:static' is not supported, 'position:absolute' nodes are always positioned relative to their immediate parent

87%overflow
overflow:visible✅ Supported
overflow:clip✅ Supported
overflow:hidden✅ Supported
overflow:scroll✅ Supported
overflow:auto❌ Not supported
86%box-sizing✅ Supported
86%z-index✅ Supported
85%cursor
keyword✅ Supported
custom image❌ Not supported
82%content (::before / ::after)
string✅ Supported
image❌ Not supported
gradient❌ Not supported
counter❌ Not supported
74%float✅ Supported
61%clear✅ Supported
41%order✅ Supported
28%zoom❌ Not supported

Visibility, Clipping & Isolation

% usePropertyStatus
87%opacity✅ Supported

Nodes with opacity are currently clipped regardless of the overflow style

75%visibility✅ Supported
53%clip-path❌ Not supported blitz#211
25%mask❌ Not supported
22%contain❌ Not supported
16%isolation❌ Not supported
8%content-visibility❌ Not supported

Sizing & Positioning

Flow relative versions of properties (e.g. max-inline-size) are also supported

% usePropertyStatus
93%width / height✅ Supported
80%min-width / min-height✅ Supported
83%max-width / max-height✅ Supported
90%inset✅ Supported
62%gap✅ Supported
33%aspect-ratio✅ Supported
50%object-fit✅ Supported
18%object-position✅ Supported

Padding, Margin & Borders

Flow relative versions of properties (e.g. padding-inline-start) are also supported

% usePropertyStatus
92%padding✅ Supported
91%margin✅ Supported
86%border-radius✅ Supported
77%border-color✅ Supported
66%border-width✅ Supported
62%border-style❌ Not supported
6%border-image❌ Not supported

Text Direction

% usePropertyStatus
45%direction⚠️ Partial support

Supported for block-level but not inline-level boxes. Auto-detection of RTL text is support for inline content.

15%all✅ Supported
14%unicode-bidi❌ Not supported
7%writing-mode❌ Not supported

Font

% usePropertyStatus
72%@font-face✅ Supported

It is not yet possible to override the family name or other matching criteria.

90%font-size✅ Supported
88%font-family✅ Supported
88%font-weight✅ Supported
80%font-style✅ Supported
50%font-display❌ Not supported
28%font-variant❌ Not supported
28%font-stretch✅ Supported
22%font-feature-settings❌ Not supported blitz#184
21%font-variation-settings✅ Supported
8%font-variant-ligatures❌ Not supported

Text

% usePropertyStatus
90%color✅ Supported
87%text-align✅ Supported
86%line-height✅ Supported
83%text-decoration✅ Supported
82%vertical-align❌ Not supported parley#291
82%white-space-collapse⚠️ Partial support
82%text-wrap-mode✅ Supported
73%text-transform
uppercase✅ Supported
lowercase✅ Supported
capitalize❌ Not supported
67%letter-spacing✅ Supported
66%text-overflow❌ Not supported parley#304
57%word-break✅ Supported
43%webkit-line-clamp❌ Not supported
41%overflow-wrap / word-wrap✅ Supported
36%text-indent✅ Supported
23%text-wrap-style❌ Not supported
22%text-decoration-line❌ Not supported
17%text-decoration-color✅ Supported
17%text-underline-offset❌ Not supported
13%word-spacing✅ Supported
13%tab-size❌ Not supported
12%text-decoration-thickness❌ Not supported
11%hyphens❌ Not supported
10%webkit-text-fill-color❌ Not supported
8%quotes❌ Not supported

Backgrounds

% usePropertyStatus
90%background-color✅ Supported
77%background-image✅ Supported
75%background-position✅ Supported
72%background-size✅ Supported
72%background-repeat✅ Supported
45%background-clip✅ Supported
8%background-origin✅ Supported
8%background-attachment❌ Not supported

Flexbox

% usePropertyStatus
74%flex-direction✅ Supported
69%flex-wrap✅ Supported
59%flex-grow✅ Supported
60%flex-shrink✅ Supported
42%flex-basis✅ Supported
0%webkit-box-*❌ Not supported

These properties are for the legacy flexbox model that was never widely adopted. Blitz does not ever intend to support these.

Grid

% usePropertyStatus
45%grid-template-{rows,columns}
px / percentage / fr✅ Supported
min-content / max-content / auto✅ Supported
fit-content()✅ Supported
named lines✅ Supported
subgrid❌ Not supported taffy#468
26%grid-{row,column}✅ Supported
24%grid-area✅ Supported
18%grid-template-areas✅ Supported
14%grid-auto-flow✅ Supported
10%grid-auto-{rows,columns}✅ Supported

Box Alignment

% usePropertyStatus
79%{align,justify}-content✅ Supported
80%{align,justify}-items✅ Supported
54%{align,justify}-self✅ Supported

Transforms

% usePropertyStatus
84%2D Transforms⚠️ Partial support

2D transforms are currently applied visually, but hit detection doesn't yet work properly for transformed nodes

20%3D Transforms❌ Not supported

Transitions & Animations

% usePropertyStatus
80%Transitions✅ Supported
70%Animations✅ Supported

Composition & Effects

% usePropertyStatus
82%box-shadow✅ Supported
48%outline✅ Supported
51%filter❌ Not supported
43%text-shadow❌ Not supported
30%backdrop-filter❌ Not supported
10%mix-blend-mode❌ Not supported
4%background-blend-mode❌ Not supported

Lists

% usePropertyStatus
49%list-style-type✅ Supported
11%list-style-position✅ Supported
10%counter-increment✅ Supported
9%counter-reset✅ Supported

Tables

% usePropertyStatus
48%border-collapse⚠️ Partial support

It is currently assumed that borders in tables with collapsed borders are uniform (have the same width/style/color). The border styles from the first cell are used.

32%border-spacing✅ Supported
19%table-layout✅ Supported
7%caption-side❌ Not supported

SVG

Rendering SVGs (including inline SVGs) is supported, but styling SVGs is not yet supported.

% usePropertyStatus
65%fill❌ Not supported
42%stroke❌ Not supported
45%stroke-width❌ Not supported
31%stroke-dashoffset❌ Not supported
30%stroke-dasharray❌ Not supported
14%fill-opacity❌ Not supported
14%stroke-linecap❌ Not supported
9%stroke-miterlimit❌ Not supported
7%stroke-opacity❌ Not supported

Interaction & Pointer events

% usePropertyStatus
70%pointer-events❌ Not supported
67%user-select❌ Not supported
40%touch-action❌ Not supported
16%caret-color✅ Supported
7%webkit-user-drag❌ Not supported
0%webkit-tap-highlight-color❌ Not supported

User Agent Hints

% usePropertyStatus
63%webkit-font-smoothing❌ Not supported
48%appearance❌ Not supported
39%will-change❌ Not supported
35%text-rendering❌ Not supported
21%text-size-adjust❌ Not supported
21%forced-color-adjust❌ Not supported
17%color-scheme❌ Not supported
18%scrollbar-color❌ Not supported
9%overflow-anchor❌ Not supported
7%image-rendering❌ Not supported

Miscellaneous / Other

% usePropertyStatus
39%scrollbar-width❌ Not supported
36%resize❌ Not supported
11%speak❌ Not supported
9%container❌ Not supported

Scroll Behaviour

% usePropertyStatus
20%scroll-behavior❌ Not supported
16%scroll-snap-type❌ Not supported
12%scroll-snap-align❌ Not supported
7%scroll-padding❌ Not supported
0%scroll-boundary-behavior❌ Not supported
0%scroll-boundary-behavior-y❌ Not supported

Multi-column Layout

% usePropertyStatus
5%column-count❌ Not supported

@page

% usePropertyStatus
7%size❌ Not supported
5%page-break-inside❌ Not supported