On June 2, 2026, Google began the staged rollout of the stable channel of Chrome 149, headlined by "CSS Gap Decorations" for directly styling gaps in grid and flexbox layouts and by Back/Forward Cache support for pages with WebSocket connections, alongside 429 security fixes.
Jun 2, 2026 · Google Chrome · Desktop Stable
Chrome 149 cleans up the gaps — and revives WebSocket pages
Two long-standing pain points get fixed: CSS gap decorations let you style Grid & Flexbox gaps directly — no hacks — and pages with live WebSocket connections become Back/Forward Cache eligible for instant restores.
149
Stable build for Windows, Mac & Linux
429
Security fixes shipped in this release
22
Of those rated Critical
Severity of the 429 security fixes
Bars proportional to count out of 429 total fixes.
CSS gap decorations
Style the gap directly — no hacks
Extends column-rule to Grid & Flexbox and adds row-rule , so separators live in the gap without borders, pseudo-elements or extra DOM.
New: row-rule-inset , column-rule-inset , rule-break , visibility-items
Supports repeat() syntax + animation of width, color, insets
Progressive enhancement — old browsers just skip it
Enabled by default
WebSocket × bfcache
Real-time pages restore instantly
Pages with active WebSocket connections were once discarded. Now Chrome closes them on entry, making the page cacheable and restorable.
Leave page
→
Close socket
→
bfcache
→
Instant restore + reconnect
Benefits real-time apps like Notion, Figma & Slack Web.
Welcomed
Gap decorations praised as something you can “write cleanly without hacks” — a subtle but handy update. Hope for faster real-time app restores.
To verify
Implementers must check behavior when sockets are closed on bfcache entry. Large-scale evaluation is still ahead just after release.
Rollout timeline
Jun 2, 2026
Stable · v149.0.7827.53/54
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