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
92%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

Table layout is emulated with CSS Grid.

display:grid-lanes❌ Not supported
display:none✅ Supported
display:contents✅ Supported
91%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
85%box-sizing✅ Supported
85%z-index✅ Supported
84%cursor
keyword✅ Supported
custom image❌ Not supported
81%content (::before / ::after)
string✅ Supported
image❌ Not supported
gradient❌ Not supported
counter❌ Not supported
75%float✅ Supported
61%clear✅ Supported
40%order✅ Supported
29%zoom❌ Not supported

Visibility, Clipping & Isolation

% usePropertyStatus
86%opacity✅ Supported

Nodes with opacity are currently clipped regardless of the overflow style

75%visibility✅ Supported
50%clip-path❌ Not supported blitz#211
22%mask❌ Not supported
19%contain❌ Not supported
13%isolation❌ Not supported
6%content-visibility❌ Not supported

Sizing & Positioning

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

% usePropertyStatus
93%width / height✅ Supported
79%min-width / min-height✅ Supported
82%max-width / max-height✅ Supported
90%inset✅ Supported
59%gap✅ Supported
32%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
91%padding✅ Supported
91%margin✅ Supported
86%border-radius✅ Supported
76%border-color✅ Supported
66%border-width✅ Supported
60%border-style❌ Not supported
6%border-image❌ Not supported

Text Direction

% usePropertyStatus
44%direction❌ Not supported
12%unicode-bidi❌ Not supported
12%all✅ Supported
7%writing-mode❌ Not supported

Font

% usePropertyStatus
71%@font-face✅ Supported

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

89%font-size✅ Supported
88%font-family✅ Supported
88%font-weight✅ Supported
78%font-style✅ Supported
51%font-display❌ Not supported
29%font-variant❌ Not supported
20%font-feature-settings❌ Not supported blitz#184
26%font-stretch✅ Supported
18%font-variation-settings✅ Supported
6%font-variant-ligatures❌ Not supported

Text

% usePropertyStatus
90%color✅ Supported
88%text-align✅ Supported
85%line-height✅ Supported
83%text-decoration✅ Supported
81%vertical-align❌ Not supported parley#291
81%white-space-collapse⚠️ Partial support
81%text-wrap-mode✅ Supported
72%text-transform❌ Not supported
64%text-overflow❌ Not supported parley#304
65%letter-spacing✅ Supported
55%word-break✅ Supported
38%overflow-wrap / word-wrap✅ Supported
41%webkit-line-clamp❌ Not supported
38%text-indent❌ Not supported
22%text-decoration-line❌ Not supported
21%text-wrap-style❌ Not supported
12%word-spacing✅ Supported
15%text-decoration-color✅ Supported
11%hyphens❌ Not supported
11%tab-size❌ Not supported
9%quotes❌ Not supported
10%webkit-text-fill-color❌ Not supported
15%text-underline-offset❌ Not supported
12%text-decoration-thickness❌ Not supported

Backgrounds

% usePropertyStatus
89%background-color✅ Supported
77%background-image✅ Supported
74%background-position✅ Supported
72%background-size✅ Supported
71%background-repeat✅ Supported
43%background-clip✅ Supported
8%background-attachment❌ Not supported
8%background-origin✅ Supported

Flexbox

% usePropertyStatus
73%flex-direction✅ Supported
68%flex-wrap✅ Supported
58%flex-grow✅ Supported
58%flex-shrink✅ Supported
41%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
43%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
24%grid-{row,column}✅ Supported
21%grid-area✅ Supported
13%grid-template-areas✅ Supported
13%grid-auto-flow✅ Supported
10%grid-auto-{rows,columns}✅ Supported

Box Alignment

% usePropertyStatus
78%{align,justify}-content✅ Supported
78%{align,justify}-items✅ Supported
51%{align,justify}-self✅ Supported

Transforms

% usePropertyStatus
83%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
68%Animations✅ Supported

Composition & Effects

% usePropertyStatus
81%box-shadow✅ Supported
43%outline✅ Supported
46%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
47%list-style-type✅ Supported
12%list-style-position✅ Supported
10%counter-increment✅ Supported
9%counter-reset✅ Supported

Tables

% usePropertyStatus
47%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
62%fill❌ Not supported
39%stroke❌ Not supported
41%stroke-width❌ Not supported
27%stroke-dashoffset❌ Not supported
25%stroke-dasharray❌ Not supported
12%fill-opacity❌ Not supported
12%stroke-linecap❌ Not supported
8%stroke-miterlimit❌ Not supported
6%stroke-opacity❌ Not supported

Interaction & Pointer events

% usePropertyStatus
68%pointer-events❌ Not supported
66%user-select❌ Not supported
0%webkit-user-select❌ Not supported
0%webkit-tap-highlight-color❌ Not supported
41%touch-action❌ Not supported
13%caret-color❌ Not supported
6%webkit-user-drag❌ Not supported

User Agent Hints

% usePropertyStatus
62%webkit-font-smoothing❌ Not supported
45%appearance❌ Not supported
37%will-change❌ Not supported
33%text-rendering❌ Not supported
20%text-size-adjust❌ Not supported
18%forced-color-adjust❌ Not supported
16%color-scheme❌ Not supported
14%scrollbar-color❌ Not supported
7%image-rendering❌ Not supported
8%overflow-anchor❌ Not supported

Miscellaneous / Other

% usePropertyStatus
33%resize❌ Not supported
38%scrollbar-width❌ Not supported
11%speak❌ Not supported
8%container❌ Not supported

Scroll Behaviour

% usePropertyStatus
0%scroll-boundary-behavior❌ Not supported
20%scroll-behavior❌ Not supported
15%scroll-snap-type❌ Not supported
12%scroll-snap-align❌ Not supported
6%scroll-padding❌ Not supported
0%scroll-boundary-behavior-y❌ Not supported

Multi-column Layout

% usePropertyStatus
6%column-count❌ Not supported

@page

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