April 2024 web platform update

Newly available on the web platform

Newly available

• Popover: The popover HTML attribute creates an overlay to display content on top of other page content. Popovers can be shown declaratively using HTML, or using the showPopover() method. Learn more.

Now available in Chrome

Limited availability

• Asynchronously iterable streams: Asynchronous iteration of a stream allows you to use for await...of loops to iterate through a stream's incoming data. Learn more.

• Unsanitized HTML parsing methods: The Document.parseHTMLUnsafe() static method parses HTML into a DOM tree, while the setHTMLUnsafe() method of Element and ShadowRoot parses and inserts HTML into an existing tree. No sanitization applies to these methods, so never call them with user-provided HTML strings. Learn more.

Now available in Chrome Android

Limited availability

• Asynchronously iterable streams: Asynchronous iteration of a stream allows you to use for await...of loops to iterate through a stream's incoming data. Learn more.

• Unsanitized HTML parsing methods: The Document.parseHTMLUnsafe() static method parses HTML into a DOM tree, while the setHTMLUnsafe() method of Element and ShadowRoot parses and inserts HTML into an existing tree. No sanitization applies to these methods, so never call them with user-provided HTML strings. Learn more.

Now available in Edge

Limited availability

• Asynchronously iterable streams: Asynchronous iteration of a stream allows you to use for await...of loops to iterate through a stream's incoming data. Learn more.

• Unsanitized HTML parsing methods: The Document.parseHTMLUnsafe() static method parses HTML into a DOM tree, while the setHTMLUnsafe() method of Element and ShadowRoot parses and inserts HTML into an existing tree. No sanitization applies to these methods, so never call them with user-provided HTML strings. Learn more.

Now available in Firefox

Limited availability

• contextlost and contextrestored: The contextlost event for <canvas> fires when the canvas backing storage is lost, while the contextrestored event fires when it is recreated. Learn more.

• content-visibility: The content-visibility CSS property delays rendering an element, including layout and painting, until it is needed. Learn more.

Now available in Firefox for Android

Limited availability

• contextlost and contextrestored: The contextlost event for <canvas> fires when the canvas backing storage is lost, while the contextrestored event fires when it is recreated. Learn more.

• content-visibility: The content-visibility CSS property delays rendering an element, including layout and painting, until it is needed. Learn more.