Ever wish HTTP status codes were easier to remember? Check out this MDN cheatsheet that pairs each status code with an emoji to help you visualize...

   Firefox 150: web extensions can now use the Web Authentication API.Extensions can create and retrieve WebAuthn credentials for any domain covered by...

   Firefox 150: <img sizes "auto"> is now supported.Lazy-loaded images use their calculated layout size to select from srcset no more...

   New in Firefox 150: the revert-rule CSS keyword.Make a property behave as if the current rule didn't exist, letting a value from another...

   Firefox 150: light-dark() now accepts image values not just colors.Use it with images and gradients to adapt visuals based on color scheme...

   Firefox 150 ships ariaNotify() on Document and Element.Queue text to be announced by a screen reader a more ergonomic and reliable alternative to...

   Firefox 150: color-mix() now accepts more than two colors at once.Mix any number of colors in a single declaration no more nesting multiple calls...

   Have you heard of CSS Subgrid? A grid item can now pass its parent's grid lines to children, so nested elements align perfectly with the outer...

   The URL Pattern API is Newly Available Use it to match and extract parts of URLs, no need to reinvent routing logic. Supports literals, wildcards,...

   Firefox 150 ships 7 media pseudo-classes: :buffering, :muted, :paused, :playing, :seeking, :stalled, :volume-locked.Style <audio> and...

   Wait for all promises, even the failing ones Promise.allSettled() waits for every promise to finish, success or failure.â Returns status...

   ✠:only-child now matches elements with no parent The :only-child selector has been updated it can now match elements that have no parent at all,...

   ✠:only-child now matches elements with no parent The :only-child selector has been updated it can now match elements that have no parent at all,...

   Build smooth scroll experiences with CSS scroll snap œSnap scrollable containers to specific positions carousels, galleries, and paginated views with...

   Check own properties safely with Object.hasOwn() A safer alternative to hasOwnProperty, works even on objects with a null prototype.Baseline since...

   Create frosted glass effects in CSS backdrop-filter applies visual effects to the content behind an element - blur, brightness, contrast, and more...

   The CSS next-sibling combinator ( ) selects an element only when it immediately follows another, same parent, no elements between them.img p font...

   Document.caretPositionFromPoint() is Newly Available Give it an (x, y) coordinate and get back the exact DOM node and character offset. Perfect for...

   The Popover API is Baseline, no JavaScript neededTooltips, dropdowns, and menus with just HTML attributes.â popover attribute on any elementâ...

   Better error chaining is finally in JavaScript Error.cause lets you attach the original error when rethrowing, keeping full context without losing...