Should You Use `type` and `language` Attributes in HTML Script Tags?

HTML Script Tag: Type vs. Language

In the realm of HTML scripting, a longstanding debate revolves around the usage of the type and language attributes in the script tag. While the HTML specification has undergone revisions, it's crucial to understand the recommended practices for modern web development.

The Deprecated language Attribute

The language attribute has been considered obsolete for years. Its purpose was to specify the language of the embedded script, but with the standardization of JavaScript as the default scripting language, the attribute became redundant. Browsers universally recognize scripts without explicitly specifying the language, rendering its usage unnecessary.

The Optional type Attribute

The type attribute serves the purpose of conveying the MIME type of the script. While it is still technically valid to declare the type as "text/javascript" explicitly, the spec defines it as the default value. Consequently, omitting the type attribute has no detrimental effect on browser compatibility.

Omission for XHTML 1.0 and HTML 4.01

It's noteworthy that omitting either the type or language attributes in XHTML 1.0 or HTML 4.01 strict modes is not considered valid syntax. However, in HTML5 and subsequent versions, omission is acceptable.

Recommendation

As per the HTML specification and widespread web development practices, the language attribute should not be used. The type attribute is optional, and its inclusion may be superfluous. When in doubt, following the standards adherence and omitting both attributes ensures compatibility across browsers and conformance with best practices.

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