[wp-trac] [WordPress Trac] #64442: Deprecate and remove HTML5 script theme support

[WordPress Trac]

#64442: Deprecate and remove HTML5 script theme support
---------------------------+-------------------------
 Reporter:  jonsurrell     |      Owner:  (none)
     Type:  enhancement    |     Status:  new
 Priority:  normal         |  Milestone:  7.0
Component:  Script Loader  |    Version:
 Severity:  normal         |   Keywords:  2nd-opinion
  Focuses:  javascript     |
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 HTML5 script ''theme support'' is not worth considering today, themes do
 not control and are not concerned with HTML5 script rendering.
 [https://github.com/GoogleChromeLabs/wpp-research/pull/74 Data suggests
 that the overwhelming majority of page views are HTML5, not XHTML] (props
 @westonruter) and theme scripts are not broken regardless of their
 declared support.

 This declared support has two impacts, it will add a `type` attribute to
 script tags and it will add CDATA wrappers.

 This is an inline script without declared HTML5 script support:

 {{{#!xml
 <script type="text/javascript">
 /* <![CDATA[ */
 "script contents";
 /* ]]> */
 </script>
 }}}

 And the same script with support:

 {{{#!xml
 <script>
 "script contents";
 </script>
 }}}

 #64428 proposes removal of the type attribute on scripts and styles. This
 ticket focuses on all aspects of theme support for HTML5 scripts.
 Declaring HTML5 script support can be deprecated, and the CDATA and type
 attribute removed.

 The CDATA wrappers are redundant for JavaScript in HTML5 and are harmful
 where script tags do not contain JavaScript (#60320). The HTML5 checks add
 needless complication to code.

 The redundant attribute and CDATA wrappers are only relevant for XHTML.
 This requires the appropriate `Content-Type: application/xhtml+xml` HTTP
 header to be sent,
 [https://www.wpdirectory.net/search/01KD2YQR0PBPKMCRJKAT8BT760 something
 that themes do not appear to do.] The HTTP content type header is more
 closely tied to server configuration
 ([https://www.php.net/manual/en/ini.core.php#ini.default-mimetype PHP
 defaults to text/html]) than theme support. Themes do not really know
 whether a page will be served and interpreted as XHTML.

 This is part of #59883.
 Related to #64428 and #64419.

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Ticket URL: <https://core.trac.wordpress.org/ticket/64442>
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