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I'm looking for a way to edit the $head variable of the html.tpl.php. Where exactly is this variable composed and set?

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The most common way to add information to the <head> is using drupal_add_html_head().

If the data you want to alter was added using that function, you can alter it by implementing hook_html_head_alter() within a custom module. Using the alter hook requires that you know the $key of the data that was added during drupal_add_html_head().

If you want to alter CSS or JS, use hook_css_alter() and hook_js_alter() respectively.

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