display: flow-root

The element generates a block container box, and lays out its contents using flow layout. It always establishes a new block formatting context for its contents. It provides a better solution to the most use cases of the "clearfix" hack.

rem (root em) units

Type of unit similar to `em`, but relative only to the root element, not any parent element. Thus compounding does not occur as it does with `em` units.

document api: rootelement

filesystemsync api: root

filesystem api: root

intersectionobserverentry api: rootbounds

intersectionobserver api: root

intersectionobserver api: rootmargin

nodeiterator api: root

performancecontainertiming api: rootelement

shadowroot api

shadowroot api: activeelement

shadowroot api: adoptedstylesheets

shadowroot api: appendhtml

shadowroot api: appendhtmlunsafe

shadowroot api: clonable

shadowroot api: customelementregistry

shadowroot api: delegatesfocus

shadowroot api: elementfrompoint

shadowroot api: elementsfrompoint

shadowroot api: fullscreenelement

shadowroot api: getanimations

shadowroot api: gethtml

shadowroot api: getselection

shadowroot api: host

shadowroot api: innerhtml

shadowroot api: mode

shadowroot api: pictureinpictureelement

shadowroot api: pointerlockelement

shadowroot api: prependhtml

shadowroot api: prependhtmlunsafe

shadowroot api: referencetarget

shadowroot api: serializable

shadowroot api: sethtml

shadowroot api: sethtmlunsafe

shadowroot api: sethtmlunsafe: `options.sanitizer` parameter

shadowroot api: slotassignment

shadowroot api: streamappendhtml

shadowroot api: streamappendhtmlunsafe

shadowroot api: streamhtml

shadowroot api: streamhtmlunsafe

shadowroot api: streamprependhtml

shadowroot api: streamprependhtmlunsafe

shadowroot api: stylesheets

treewalker api: root

css property: display: flow-root

css selector: `:root`

svg element: use: reference an external document's root element by omitting the fragment.

global_attributes: transform: on `<svg>` root