Permitted content #

Permitted attributes #

Descriptions for attributes specific to this element #

type = MIME type

The language of the script or format of the data.

The language attribute on the script element is obsolete. You can safely omit it.

language = string OBSOLETE

Specifies that the language of the script is JavaScript.

src = URI

The address of the external script to use.

defer = "defer" or "" (empty string) or empty

Specifies that script should be executed after the document has been parsed.

async = "async" or "" (empty string) or empty NEW

Specifies that the script should be executed asynchronously, as soon as it becomes available.

charset = character encoding name

The character encoding of the external script.

Additional constraints and admonitions #

• A script element must not contain an occurrence of the character sequence "<!--" without a matching later occurrence of the character sequence "-->".
• A script element with a “src” attribute must contain only:
  • lines that consist solely of a newline, optionally preceded by one or more space (U+0020) characters or tab (U+0009) characters
  • single-line comments, which are lines beginning with the character sequence "//", optionally preceded by one more more space (U+0020) characters or tab (U+0009) characters, followed by any number of characters that are not a newline, and ending with a newline
  • multi-lines comments, which begin with the character sequence "/*", optionally preceded by one more more space (U+0020) characters or tab (U+0009) characters, and that end with the character sequence "*/"
• A script element with a language attribute whose value is “JavaScript” must not have a type attribute whose value is not “text/javascript”.
• The language attribute on the script element is obsolete. Use the type attribute instead.

Permitted parent elements #

any element that can contain metadata elements, any element that can contain phrasing elements

DOM interface #

interface HTMLScriptElement : HTMLElement {
           attribute DOMString src;
           attribute boolean async;
           attribute boolean defer;
           attribute DOMString type;
           attribute DOMString charset;
           attribute DOMString text;
};

Typical default display properties #