Printing Events

Window fires `beforeprint` and `afterprint` events so the printed document can be annotated.

CSS Generated content for pseudo-elements

Method of displaying text or images before or after the given element's contents using the ::before and ::after pseudo-elements. All browsers with support also support the `attr()` notation in the `content` property.

CSS page-break properties

Properties to control the way elements are broken across (printed) pages.

DOM manipulation convenience methods

jQuery-like methods on DOM nodes to insert nodes around or within a node, or to replace one node with another. These methods accept any number of DOM nodes or HTML strings as arguments. Includes: `ChildNode.before`, `ChildNode.after`, `ChildNode.replaceWith`, `ParentNode.prepend`, and `ParentNode.append`.

beforeinstallpromptevent api

beforeinstallpromptevent api: `beforeinstallpromptevent()` constructor

beforeinstallpromptevent api: platforms

beforeinstallpromptevent api: prompt

beforeinstallpromptevent api: userchoice

beforeunloadevent api

beforeunloadevent api: returnvalue

beforeunloadevent api: user interaction required for dialog box

characterdata api: before

documenttype api: before

document api: `beforescriptexecute` event

element api: before

element api: `beforematch` event

element api: `beforescriptexecute` event

element api: `beforexrselect` event

htmlelement api: `beforeinput` event

htmlelement api: `beforematch` event

htmlelement api: `beforetoggle` event

htmlselectelement api: add: index as `before` parameter

nodeiterator api: pointerbeforereferencenode

node api: insertbefore

range api: setendbefore

range api: setstartbefore

svglengthlist api: insertitembefore

svgnumberlist api: insertitembefore

svgpointlist api: insertitembefore

svgstringlist api: insertitembefore

window api: `beforeinstallprompt` event

window api: `beforeprint` event

window api: `beforeunload` event

window api: `beforeunload` event: activation using `event.returnvalue = "string";`

window api: `beforeunload` event: activation using `event.preventdefault()`

window api: `beforeunload` event: activation using `return "string";`

css property: -webkit-border-before

css property: break-before

css property: break-before: supported in multi-column layout

css property: break-before: supported in multi-column layout: `always`

css property: break-before: supported in multi-column layout: `avoid`

css property: break-before: supported in multi-column layout: `avoid-column`

css property: break-before: supported in multi-column layout: `column`

css property: break-before: supported in paged media

css property: break-before: supported in paged media: `always`

css property: break-before: supported in paged media: `page` and `avoid-page`

css property: break-before: supported in paged media: `recto` and `verso`

css property: page-break-before

css selector: `::before`: animation and transition support