script

1. Summary
2. Attributes

Summary

The script element is used to embed or reference an executable script within an HTML or XHTML document.

Element Type: block‐level
Allowed Content: script content

Attributes

async Requires Gecko 1.9.2: This Boolean attribute is set to indicate that the browser should, if possible, execute the script asynchronously. If the script cannot be executed asynchronously, or the browser doesn't support this attribute, the script is executed synchronously (and loading the content blocks until the script finishes running). Never call document.write() from an async script. In Gecko 1.9.2, calling document.write() has an unpredictable effect. In future versions, calling document.write() from an async script is expected to replace the entire document. The async attribute should only be used together with the src attribute, and is ignored if the src attribute isn't present.
src: This attribute specifies the URI of an external script; this can be used as an alternative to embedding a script directly within a document. script elements with an src attribute specified should not have a script embedded within its tags.
type: This attribute identifies the scripting language of code embedded within a script element or referenced via the element’s src attribute. This is specified as a MIME type; examples of supported MIME types include text/javascript, text/ecmascript, application/javascript, and application/ecmascript. If this attribute is absent, the script is treated as JavaScript.
language Deprecated: Like the type attribute, this attribute identifies the scripting language in use. Unlike the type attribute, however, this attribute’s possible values were never standardized. The type attribute should be used instead.
defer Requires Gecko 1.9.1: This Boolean attribute is set to indicate to a browser that the script is meant to be executed after the document has been parsed. Since this feature hasn't yet been implemented by all other major browsers, authors should not assume that the script’s execution will actually be deferred. Never call document.write() from a defer script (since Gecko 1.9.2, this will blow away the document). The defer attribute shouldn't be used on scripts that don't have the src attribute. Since Gecko 1.9.2, the defer attribute is ignored on scripts that don't have the src attribute. However, in Gecko 1.9.1 even inline scripts are deferred if the defer attribute is set.