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category_css_class

Filters the list of CSS classes to include with each category in the list.

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wp_dropdown_categories

Display or retrieve the HTML dropdown list of categories.

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add_settings_field

Add a new field to a section of a settings page.

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options_discussion_add_js

Output JavaScript to toggle display of additional settings if avatars are disabled.

wp_admin_canonical_url

Remove single-use URL parameters and create canonical link based on new URL.