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MM-60419 - fix styling regression by adding back placeholder injection link element (#28219)

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* MM-60419 - fix styling regression by adding back placeholder injection link

* add relevant comment

* add more details to how the link element work

* Update webapp/channels/src/root.html

---------

Co-authored-by: Harrison Healey <harrisonmhealey@gmail.com>
Co-authored-by: Mattermost Build <build@mattermost.com>
This commit is contained in:
Pablo Vélez
2024-09-24 15:28:35 +02:00
committed by GitHub
co-authored by Harrison Healey Mattermost Build
parent 5c7f99921b
commit 88ad3bb95b
1 changed files with 9 additions and 0 deletions
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webapp/channels/src/root.html
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@@ -19,6 +19,15 @@
<link rel="icon" type="image/png" href="/static/images/favicon/favicon-default-64x64.png" sizes="64x64">
<link rel="icon" type="image/png" href="/static/images/favicon/favicon-default-96x96.png" sizes="96x96">
<!--
This "empty" link element is used as a dynamic inject placeholder for the syntax highlighting css styles:
1. The highlight.js lib finds this element by its 'code_theme' class.
2. The lib dynamically defines the 'href' attribute and its value to load the required CSS for the detected language by its detection logic.
3. This allows it to do at runtime theme switching without havint to modifying the DOM structure.
4. The 'href' attribute is empty to prevent unnecessary HTTP requests.
-->
<link rel='stylesheet' class='code_theme'>
<!-- We need this CSS first to show the initial loading screen -->
<link id="initialLoadingScreenCSS" rel='stylesheet' href='/static/css/initial_loading_screen.css'>
</head>