Stop sending SCRIPT and STYLE type attribute for default values.

[dmsnell]

The script-loader and WP_Styles both make checks against current_theme_supports( 'html5', 'style' ) and current_theme_supports( 'html5', 'script' ), and multiple places in the rest of the codebase unconditionally produce type="text/css" and type="text/javascript" HTML attributes on the associated tags.

This is a legacy convention predating HTML5 in 2008 and can be removed. These are the default values when the attributes are absent, and this does not depend on or change with declared theme support.

Removing the type attribute simplifies logic and normalizes the produced HTML content.

This is part of #59883

See also ​PR#10641

[jonsurrell]

The CDATA wrappers added to SCRIPT tags are a similar feature that should be good to remove as well, that can be a separate ticket and related to follow-up work on #64419.

[hardikhuptechdev]

Removes redundant type attributes (text/javascript and text/css) from SCRIPT and STYLE tags. Verified via PHPCS and PHPUnit; no regressions found.

Trac ticket:

[hardikhuptechdev]

Rebuilt patch from trunk. Removes default type attributes from SCRIPT and STYLE elements. Verified with npm run build and PHPUnit; passes tests.

[jonsurrell]

Thanks @hardikhuptechdev. Just for clarity, ​creating a PR like this is sufficient, there's no need to upload patches here.

A whole bunch of unit tests will need to be updated to account for the removal of the type attribute. That is, unless assertEqualHTML is updated to count the absence of type as the same as if type="text/javascript" is present?

unless assertEqualHTML is updated to count the absence of type as the same as if type="text/javascript" is present?

I think it's important that these tests show differences in this case. I'd like assertEqualHTML to remain a faithful representation of the HTML.

• Trac #64428: Remove default type attributes from SCRIPT and STYLE elements
• Trac #64428: Restore CDATA condition and keep explicitly set script types.
• Remove text/css type attribute from theme style tags
• Remove text/css type attribute from theme link tags
• Remove text/css type from style tags
• Remove type-attr from class-wp-styles
• Remove text/css type from class-wp-font-face
• Remove text/css type from Core LINK tags

Trac ticket:

I've done some more work on this ticket in ​https://github.com/WordPress/wordpress-develop/pull/10658.

This has a lot of overlap with ​https://github.com/WordPress/wordpress-develop/pull/10660.