CSS Container Queries (Size)
Size queries in Container Queries provide a way to query the size of a container, and conditionally apply CSS to the content of that container.
CSS Container Style Queries
Style queries in Container Queries provide a way to query the current styling of a container, and conditionally apply additional CSS to the contents of that container.
CSS Container Query Units
Container Query Units specify a length relative to the dimensions of a query container. The units include: `cqw`, `cqh`, `cqi`, `cqb`, `cqmin`, and `cqmax`.
CSS Feature Queries
CSS Feature Queries allow authors to condition rules based on whether particular property declarations are supported in CSS using the @supports at rule.
Media Queries: interaction media features
Allows a media query to be set based on the presence and accuracy of the user's pointing device, and whether they have the ability to hover over elements on the page. This includes the `pointer`, `any-pointer`, `hover`, and `any-hover` media features.
Media Queries: Range Syntax
Syntax improvements to make media queries using features that have a "range" type (like width or height) less verbose. Can be used with ordinary mathematical comparison operators: `>`, `<`, `>=`, or `<=`. For example: `@media (100px <= width <= 1900px)` is the equivalent of `@media (min-width: 100px) and (max-width: 1900px)`
Media Queries: resolution feature
Allows a media query to be set based on the device pixels used per CSS unit. While the standard uses `min`/`max-resolution` for this, some browsers support the older non-standard `device-pixel-ratio` media query.
CSS3 Media Queries
Method of applying styles based on media information. Includes things like page and device dimensions
High-quality kerning pairs & ligatures
When used in HTML, the unofficial `text-rendering: optimizeLegibility` CSS property enables high-quality kerning and ligatures in certain browsers. Newer browsers have this behavior enabled by default.
matchMedia
API for finding out whether or not a media query applies to the document.
Payment Request API
Payment Request is a new API for the open web that makes checkout flows easier, faster and consistent on shopping sites.
prefers-color-scheme media query
Media query to detect if the user has set their system to use a light or dark color theme.
prefers-reduced-motion media query
CSS media query based on a user preference for preferring reduced motion (animation, etc).
querySelector/querySelectorAll
Method of accessing DOM elements using CSS selectors
requestAnimationFrame
API allowing a more efficient way of running script-based animation, compared to traditional methods using timeouts. Also covers support for `cancelAnimationFrame`
requestIdleCallback
API allowing the execution of JavaScript to be queued to run in idle browser time, either at the end of a frame or when the user is inactive. Also covers support for `cancelIdleCallback`. The API has similarities with `requestAnimationFrame`.
Web SQL Database
Method of storing data client-side, allows SQLite database queries for access and manipulation.
Upgrade Insecure Requests
Declare that browsers should transparently upgrade HTTP resources on a website to HTTPS.
XMLHttpRequest advanced features
Updated functionality to the original XHR specification including things like file uploads, transfer progress information and the ability to send FormData. Previously known as [XMLHttpRequest Level 2](https://www.w3.org/TR/2012/WD-XMLHttpRequest-20120117/), these features now appear simply in the XMLHttpRequest spec.
canvasrenderingcontext2d api: quadraticcurveto
css api: `q()` static method
documentfragment api: queryselector
documentfragment api: queryselectorall
document api: querycommandenabled
document api: querycommandindeterm
document api: querycommandstate
document api: querycommandsupported
document api: querycommandvalue
document api: queryselector
document api: queryselectorall
element api: queryselector
element api: queryselectorall
filesystemhandle api: querypermission
gpudevice api: queue
lockmanager api: query
offscreencanvasrenderingcontext2d api: quadraticcurveto
orientationsensor api: quaternion
path2d api: quadraticcurveto
permissions api: query
queuemicrotask api
window api: querylocalfonts
css at-rule: `@container`: style queries for custom properties
css at-rule: `@media`: media query value support
css at-rule: `@media`: nested media queries
css property: quotes
css property: quotes: auto
css property: quotes: none
html element: q
html element: q: cite
regular_expressions: quantifier: `*`, `+`, `?`, `{n}`, `{n,}`, `{n,m}`
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