Scoped Styles: the @scope rule
Allows CSS rules to be scoped to part of the document, with upper and lower limits described by selectors.
CSS clip-path property (for HTML)
Method of defining the visible region of an HTML element using SVG or a shape definition.
CSS Filter Effects
Method of applying filter effects using the `filter` property to elements, matching filters available in SVG. Filter functions include blur, brightness, contrast, drop-shadow, grayscale, hue-rotate, invert, opacity, sepia and saturate.
:focus-within CSS pseudo-class
The `:focus-within` pseudo-class matches elements that either themselves match `:focus` or that have descendants which match `:focus`.
selector list argument of :nth-child and :nth-last-child CSS pseudo-classes
The newest versions of `:nth-child()` and `:nth-last-child()` accept an optional `of S` clause which filters the children to only those which match the selector list `S`. For example, `:nth-child(1 of .foo)` selects the first child among the children that have the `foo` class (ignoring any non-`foo` children which precede that child). Similar to `:nth-of-type`, but for arbitrary selectors instead of only type selectors.
disabled attribute of the fieldset element
Allows disabling all of the form control descendants of a fieldset via a `disabled` attribute on the fieldset element itself.
CSS font-smooth
Controls the application of anti-aliasing when fonts are rendered.
Input Method Editor API
Provides scripted access to the Input Method Editor (IME). An IME is often used to input characters from East Asian languages by typing roman characters and selecting from the resulting suggestions.
Minimum length attribute for input fields
Declares a lower bound on the number of characters a user can input.
Element.insertAdjacentHTML()
Inserts a string of HTML into a specified position in the DOM relative to the given element.
maxlength attribute for input and textarea elements
Declares an upper bound on the number of characters the user can input. Normally the UI ignores attempts by the user to type in additional characters beyond this limit.
theme-color Meta Tag
Meta tag to define a suggested color that browsers should use to customize the display of the page or of the surrounding user interface. The meta tag overrides any theme-color set in the web app manifest.
Ogg/Theora video format
Free lossy video compression format.
Path2D
Allows path objects to be declared on 2D canvas surfaces
Web Bluetooth
Allows web sites to communicate over GATT with nearby user-selected Bluetooth devices in a secure and privacy-preserving way.
Web Authentication API
The Web Authentication API is an extension of the Credential Management API that enables strong authentication with public key cryptography, enabling password-less authentication and / or secure second-factor authentication without SMS texts.
abortsignal api: throwifaborted
dynamicscompressornode api: threshold
htmltableelement api: thead
idbindex api: name: renaming through `name` setter
intersectionobserver api: thresholds
html element: meta: name: theme-color
html element: th
html element: thead
html element: thead: align
html element: thead: bgcolor
html element: thead: char
html element: thead: charoff
html element: thead: valign
html element: th: abbr
html element: th: align
html element: th: axis
html element: th: bgcolor
html element: th: char
html element: th: charoff
html element: th: colspan
html element: th: headers
html element: th: rowspan
html element: th: scope
html element: th: valign
manifest: theme_color
javascript built-in: generator: throw
javascript operator: greater than (`a > b`)
javascript operator: greater than or equal (`a >= b`)
javascript operator: less than (`a < b`)
javascript operator: less than or equal (`a <= b`)
javascript operator: this
javascript statement: throw
the react javascript library
the vue.js framework
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