Explanation of Terms

Availability

Availability tells the versions of Safari in which the element first appeared or was deprecated. Deprecated tags are not guaranteed to be supported in the future. Elements available in Safari for Mac OS X and Windows are not automatically available in iOS, and vice versa.

Support Level

Support Level tells the source of a given tag if it is not part of a W3C standard or otherwise supported by the majority of current browsers. The possible values are:

• Apple extension—properties defined by Apple. These properties are fully supported by WebKit and Safari. A few of these extensions, where noted, are specific to Safari on iOS.

Tags may be shifted to other categories as time passes, particularly as tags are added to relevant standards.