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Web Platform Baseline Status Breakdown Total Features: 1219
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Categories: All CSS (102) HTML elements (100) Selectors (46) JavaScript (43) Forms (42)
WebGL extensions (37) Text (26) WebAssembly (22) Media queries (21) Scrolling (20) Fonts (19) Performance (19) Arrays (17) Layout (17) HTML (16) Progressive web app (15) Typed arrays (14) Units (14) Canvas (13) Color types (13) Strings (13) Background (12) Media elements (12) Security (12) Animation (11) Clipping, shapes, and masking (11) Web components (11) WebXR (11) Typographic font features (10) DOM (9) Internationalization (9) Iterators (9) Reporting (9) Text wrap (9) Workers (9) Clipboard (8) CSS object models (7) Containment (7) Fetch (7) JavaScript modules (7) Print media (7) Sensors (7) Container queries (6) Explicit defaults (6) Image formats (6) Landmark elements (6) Multi-column (6) Positioning (6) Promises (6) SVG (6) Storage (6) Streams (6) Credential management (5) Custom elements (5) Font synthesis (5) HTTP (5) Lists (5) Messaging (5) Resource hints (5) Ruby (5) Selection (5) Speech (5) Transitions (CSS) (5) View transitions (5) Web audio (5) WebGL (5) Anchor positioning (4) Cookies (4) Counters (4) File system access (4) Flexbox (4) Gamepad (4) Grid (4) Images (4) Primitive types (4) Regular expressions (4) WebDriver (4) WebRTC (4) Blend mode (3) Borders and outlines (3) Geolocation (3) Gradients (3) Image scaling (3) JSON (3) Maps (3) MathML (3) Payments (3) Reading order (3) Scroll markers (3) Transforms (3) WebAuthn (3) WebGPU (3) White space (3) Worklets (3) XML (3) Collections (2) Compute pressure (2) IndexedDB (2) Parsing and serialization (2) Resource integrity (2) Sets (2) Text fragments (2) WebMCP (2) CSS environment variables (1)
Years: All 2021 2015
Showing 4 of 4 features

2021

1 features
• April 2021
Widely Available

The gap CSS property in a flexbox layout sets the size of the space between items.

Chrome 84
Firefox 63
Safari 14.1
Edge 84
Baseline Date: Apr 26, 2021

2015

1 features
• September 2015
Widely Available

Flexbox is a one-dimensional layout system, which places content either horizontally or vertically, with optional wrapping.

Chrome 29
Firefox 20
Safari 9
Edge 12
Baseline Date: Sep 30, 2015

Limited Availability

2 features
• In Progress / Not Yet Baseline

The flex-wrap: balance CSS declaration distributes items in a multi-line flex container such that each line has about the same number of items.

Chrome 150
Firefox —
Safari —
Edge 150
Status: Incomplete cross-engine support

The column-rule and row-rule CSS properties display decorative lines between columns and rows of a flex, grid, or multi-column layout. The rule-break, rule-outset, and rule-paint-order properties control the appearance of these lines.

Chrome 149
Firefox —
Safari —
Edge 149
Status: Incomplete cross-engine support