Web Platform Baseline Status Breakdown
Total Features: 1219
Categories:
All
CSS (35)
Progressive web app (15)
WebGL extensions (12)
Forms (11)
JavaScript (11)
Performance (11)
WebXR (11)
HTML elements (10)
Scrolling (10)
Selectors (10)
Layout (8)
HTML (7)
Media queries (7)
Reporting (7)
Text (7)
Media elements (6)
Sensors (6)
Canvas (5)
Clipboard (5)
Fonts (5)
Anchor positioning (4)
Animation (4)
CSS object models (4)
Credential management (4)
DOM (4)
Fetch (4)
Speech (4)
WebAssembly (4)
WebDriver (4)
Background (3)
Container queries (3)
Gamepad (3)
Images (3)
Iterators (3)
JavaScript modules (3)
Multi-column (3)
Payments (3)
Print media (3)
Scroll markers (3)
Selection (3)
Storage (3)
Streams (3)
Text wrap (3)
Typographic font features (3)
Web components (3)
WebGL (3)
WebGPU (3)
Clipping, shapes, and masking (2)
Color types (2)
Compute pressure (2)
Cookies (2)
Custom elements (2)
Flexbox (2)
Geolocation (2)
Image formats (2)
Lists (2)
Reading order (2)
Regular expressions (2)
Ruby (2)
SVG (2)
Security (2)
View transitions (2)
Web audio (2)
WebMCP (2)
Workers (2)
Worklets (2)
Counters (1)
File system access (1)
Font synthesis (1)
Grid (1)
Image scaling (1)
IndexedDB (1)
MathML (1)
Resource hints (1)
Resource integrity (1)
Strings (1)
Transitions (CSS) (1)
WebAuthn (1)
XML (1)
Years:
All
Limited Availability
4 features
• In Progress / Not Yet Baseline
Limited
A CSSPseudoElement object represents a pseudo-element and its context in the document tree. You get an instance through the pseudo() method of Element or CSSPseudoElement objects or the pseudoTarget property of some events.
Chrome
149
Firefox
—
Safari
—
Edge
149
Status: Incomplete cross-engine support
The CSSStyleValue and its subclasses represent CSS values as distinct types instead of only strings. Also known as typed OM.
Chrome
66
Firefox
—
Safari
16.4
Edge
79
Status: Incomplete cross-engine support
The numeric factory functions, such as CSS.px() or CSS.kHz(), return a CSSUnitValue representing a CSS number value (as in 12px or 440kHz).
Chrome
66
Firefox
—
Safari
16.4
Edge
79
Status: Incomplete cross-engine support
The DOM level 2 style specification defined interfaces to access and modify CSS styles, such as CSSValue and CSSPrimitiveValue, that were later excluded from the CSS object model.
Chrome
—
Firefox
—
Safari
10
Edge
—
Status: Incomplete cross-engine support