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

Newly available across browsers

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.
Promise.try(): The Promise.try() static method returns a promise that takes a callback of any kind (returns or throws, synchronously or asynchronously) and wraps its result in a Promise.
Page setup: The @page CSS at-rule sets the page-specific dimensions and margins for content such as printed documents, ebooks, or slides.
ruby-align: The ruby-align CSS property sets the spacing and alignment of ruby annotation text when it does not fill its available space.
ruby-position: The ruby-position CSS property sets the position of a ruby annotation in relation to its base text. Annotations can display over, under, or interleaved with the base text.

Style containment: The contain: style CSS declaration permits the browser to avoid slower layout calculations by preventing modification to counter (counter-increment and counter-set) and quotation styles (content property quote values) beyond the element's descendants.
Exception handling (WebAssembly): Exceptions break the normal control flow of execution to represent exceptional behavior, such as an error. You can respond to the exception in JavaScript code.
appearance: The appearance CSS property controls the appearance of form controls. Using appearance: none disables any default native appearance and allows the elements to be styled with CSS.
Array at(): The at() method of arrays and typed arrays returns the item at an index, including negative indices for getting items relative to the end of an array. Also known as the relative indexing method.
::backdrop: The ::backdrop CSS pseudo-element is a box underneath an element in the top layer, such as a <dialog>. It can be used to create obscuring effects distinguishing a modal element from the elements underneath.