CSS Flexible Box Layout Module
Method of positioning elements in horizontal or vertical stacks. Support includes all properties prefixed with `flex`, as well as `display: flex`, `display: inline-flex`, `align-content`, `align-items`, `align-self`, `justify-content` and `order`.
WebAssembly Threads and Atomics
An extension to WebAssembly adding shared memory and atomic memory operations
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.
cssimportrule api: href
htmlanchorelement api: href
htmlanchorelement api: hreflang
htmlareaelement api: href
htmlbaseelement api: href
htmllinkelement api: href
htmllinkelement api: hreflang
location api: href
stylesheet api: href
svgaelement api: href
svgaelement api: hreflang
svgfeimageelement api: href
svgfilterelement api: href
svggradientelement api: href
svgimageelement api: href
svgmpathelement api: href
svgpatternelement api: href
svgscriptelement api: href
svgtextpathelement api: href
svguseelement api: href
url api: href
workerlocation api: href
html element: area: href
html element: a: href
html element: a: hreflang
html element: a: href: `href = '#top'`
html element: base: href
html element: base: href: `data:` and `javascript:` urls are not allowed
html element: base: href: relative uris.
html element: hr
html element: hr: align
html element: hr: color
html element: hr: `<hr>` in `<select>`
html element: hr: noshade
html element: hr: size
html element: hr: width
html element: link: href
html element: link: hreflang
svg element: a: href
svg element: a: hreflang
svg element: cursor: href
svg element: feimage: href
svg element: pattern: href
svg element: radialgradient: href
svg element: textpath: href
svg element: use: href
global_attributes: href
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