All 115 elements of the current HTML specification laid out as a periodic table: search, filters by spec section and links to MDN.

See charts from the Chrome UX Report History API

Learn what the Server-Timing header is and how to track server-side performance metrics.

Join us at Search Central Live Europe 2026 - the first time in EU, multiday flagship event about Search and SEO hosted by the Google Search team featuring talks from Google and community speakers, net...

How the CrUX 28-day rolling window actually works, what each source publishes, and why p75 takes so long to move even though the data is only two days old.

How the joke web standard cats.txt took the fancy of some SEOs and became cited at the same evidential level as llms.txt for optimising websites for search and AI discovery.

Step-by-step local schema training—from basics to advanced tips—with quizzes to cement your skills.

Test a single IP, or list of IPs to see if it's really Googlebot, or other Google crawler. Also checks for special case crawlers and the private prefetch proxy.

Former eBay executives carried out "unprecedented" harassment over a critical newsletter.

A fairly common belief is that Google stop rendering pages after 5 seconds, I did some testing to show that's not true, but why your measurements might be lying to you to make you think so, because time in the web rendering service is artificial.

See what a user agent downloads, follows, and executes.

Test an IP address to see if it belongs to a real LLM bot — GPTBot, OAISearchBot, ChatGPT-User, PerplexityBot, Perplexity-User, DuckAssistBot, or AppleBot.

Because we've decided bots deserve better treatment than users

Fetch, render and test your webpage like a bot would, compare inital & rendered html, see how robots.txt affects a page and more

Now both Google and Bing offer some metrics, how closely does a site perform in both?

Our 4th networking event. WPP Campus, Manchester, 18 June 2026, 5:45pm–9pm.

A place to explore and discuss the web performance trends and best practices.

YouTube video by Google Search Central

A search engine for OLD websites hosted in services like Geocities, Angelfire, Xoom, AOL, Tripod and so on!