On 19th and 20th of November 2026, the web performance community will gather at performance.now() in Amsterdam to discuss today’s most important web performance insights.

On 19th and 20th of November 2026, the seventh edition of performance.now() will take place in Amsterdam—a single track conference, covering today’s most important web performance insights.

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This proposal follows "Approach 1" in #10378 to: Add a new HTML video element posterfromimg attribute, opting a video element into allowing a child img element to govern poster image sel...

The mountain doesn't care if you're ready. See how long *you* can stay alive in the wild!

At Squarespace, many of our core products are built on web standards, and our engineers are constantly pushing the boundaries of the web’s capabilities. Occasionally, those boundaries reveal a limitat...

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Understand CSS as a system — so you can write, review, and maintain web styles with confidence on a timeline and under budget.

Test the proposed install element.

A new project and some thoughts on the times