Stay up-to-date with the web platform

Use the Web platform features explorer to discover new features and APIs and stay up-to-date with changes.

Subscribe to RSS feeds

field-sizing: The field-sizing CSS property allows form controls such as <textarea> to be sized based on their content.
Container style queries: Container style queries with the @container at-rule apply styles to an element based on the values of custom properties of its container.
:open: The :open CSS pseudo-class matches elements that have open states, like <details>, <dialog>, or <select>, based on their state.
ToggleEvent source: The source property of a ToggleEvent object is the element which triggered the toggle event to fire for a popover, <dialog>, or <details> element, if applicable.
crisp-edges: The image-rendering: crisp-edges CSS declaration scales images to preserve lines without blurring.

:has(): The :has() CSS functional pseudo-class matches an element if any of the selectors passed as parameters would match at least one element.
Lazy-loading images and iframes: The loading="lazy" attribute for <img> and <iframe> elements blocks loading the external resource until the user scrolls to that element's part of the page.
Canvas reset(): The reset() method clears a canvas to its initial state.
cap unit: The cap CSS length unit corresponds to the height of Latin capital letters.
counter-set: The counter-set CSS property creates (and optionally sets a value for) a counter, the numbers for a series of headings or ordered list items.