The File API represents and reads from file data and metadata. Typically, you get files through other APIs, such as the <input type="file"> element or drag-and-drop events. You may also send file data to other APIs, such as creating images or drawing on canvases.

The document.fonts API dynamically loads custom fonts and tracks when fonts are loading or ready to use.

The hsl() and hsla() CSS functions pick colors using hue, saturation, lightness, and alpha (transparency) channels.

The :host CSS pseudo-class selects the containing element of the shadow tree in which it is used. The :host() CSS pseudo-class selects the that element only if it matches the provided selector.

The ImageBitmapRenderingContext API is the "bitmaprenderer" rendering context for the <canvas> element. It is commonly used to transfer frames from an OffscreenCanvas to a user-visible <canvas> element.

The unicode-bidi and direction CSS properties override the Unicode layout algorithm. They are intended for Document Type Definition (DTD) designers. For HTML documents, you should use the dir global HTML attribute and <bdo> HTML element instead.

The :link CSS pseudo-class matches unvisited links, :visited matches visited links, and :any-link matches both.

When a document is loaded over HTTPS, browsers ensure that none of the document's resources are loaded over an insecure protocol. Instead, resources that the document attempts to load over an insecure protocol are either loaded over HTTPS or are blocked.

Omit the binding parameter of a catch clause when you don't need information about the exception in a try ... catch statement.

The PNG (Portable Network Graphics) image format is a raster graphics file format with animation, alpha transparency, and lossless compression.

The rgb(), rgba(), and hexadecimal (as in #004488ff) notations pick colors using red, green, blue, and alpha (transparency) channels.

The <animate>, <animateMotion>, and <animateTransform> SVG elements declaratively animate SVG elements. Also known as SMIL.

The SVG image format, represented by the <svg> element, creates two-dimensional vector graphics with declarative or scripted interaction and animation.

The safe-area-inset- CSS environment variables represent a rectangle that cannot cut off content within a non-rectangular screen. For example, top:\ env(safe-area-inset-top); positions the top of an element below the notch on an iPhone.

CSS scroll snap controls the panning and scrolling behavior within a scroll container.

The EventSource API creates a connection to a server and listens to a stream of events sent by the server.

Shadow DOM allows you to attach encapsulated "shadow" DOM trees to elements. A shadow DOM tree is a separate component, isolated from the scripts and styles in other parts of the document. This is a part of Web Components.

The Sourcemap HTTP response header links generated code to a source map, so the browser shows the original source in a debugger. This makes it easier to work with minified or transpiled code.

The spread (...) syntax allows an iterable, such as an array or string, to be expanded in places where zero or more arguments (for function calls) or elements (for array literals) are expected.

Stable array sort() function

The matchAll() method of strings matches a string against a regular expression and returns an iterator of all results, including capturing groups.

The trimStart() and trimEnd() methods of strings return a new string with whitespace removed from the beginning or end of the string.

Template literals are literals delimited with backtick (`) characters, allowing for multi-line strings, string interpolation with embedded expressions, and special constructs called tagged templates.

The TextEncoder API transforms a stream of code points into a byte stream with UTF-8 encoding, and TextDecoder does the reverse.

The WEBGL_compressed_texture_astc extension for WebGL 1.0 and 2.0 contexts adds the Adaptive Scalable Texture Compression format to compressedTexImage2D() and compressedTexSubImage2D().

The WebRTC API establishes real-time communication channels directly between browsers. It is commonly used in video conferencing applications.

The RTCPeerConnection.getStats(), RTCRtpSender.getStats(), and RTCRtpReceiver.getStats() methods return detailed information about the status, performance, network, and media for a given WebRTC connection.

The VTTCue API updates various aspects of cues dynamically, such as alignment, size and position.

The all CSS property is a shorthand for all CSS properties, except for direction and unicode-bidi. It accepts only the keywords for explicit defaulting (such as initial and inherit), since they are the only values supported on all CSS properties.

The background-blend-mode CSS property blends an element's background image and background color using blend modes like multiply, difference, or color.