Assess WebDriver BiDi's current standardization and browser-support status before migrating a Selenium or Puppeteer suite off classic WebDriver/CDP
domain: w3c.github.io · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Check the live spec status at the W3C WebDriver BiDi draft — it remains a Working/Editor's Draft, not yet a full W3C Recommendation, so treat the protocol surface as still evolving
Confirm per-browser support before depending on a feature: Firefox and Chrome/Edge implement BiDi, with Firefox further along toward production-ready status; Safari/WebKit has no BiDi support yet
In Puppeteer, note that Chrome still launches over CDP by default because not all CDP-parity features are implemented over BiDi, while Firefox defaults to BiDi
In Selenium 4, BiDi-based commands (e.g. network interception, log subscription) run alongside classic WebDriver in the same session rather than requiring a full protocol switch
Migrate incrementally — keep classic WebDriver/CDP for capabilities BiDi doesn't yet cover on your target browsers, adopting BiDi only where you've verified parity
Known gotchas
BiDi feature parity with CDP is still incomplete and varies by tool and browser version — verify a specific capability actually works on your exact driver/browser combination before relying on it
A tool can expose a BiDi-shaped API while still falling back to CDP internally for unsupported operations, so behavior can silently differ between browsers using the 'same' API
Code written against BiDi is not automatically Safari-compatible, since WebKit has not shipped BiDi support as of this writing
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