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Wordpress Additional CSS

This image shows the Additional CSS feature in Wordpress. I'm trying to find the file that stores the additional CSS, but can't seem to find it anywhere - I've searched almost every folder in wp-content!

Does anyone know how Additional CSS for the theme is stored and, if it is in a file, where this file is located!

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It's stored in the database, within the wp_posts table, under the custom_css post type, where the post name is the theme slug. There you also have the related customize_changeset and revision post types.

The custom css post ID is also stored in the wp_options table under each theme mods, e.g. theme_mods_twentysixteen for Twenty Sixteen.

It's informative to check out how the custom CSS fetched from the database with:

and displayed through the wp_head action with:

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  • If it's stored in the database does that mean that it will not be removed if/when I update my theme? – theyuv Oct 4 '17 at 13:15
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    updating the current theme, shouldn't remove the stored CSS. – birgire Oct 4 '17 at 15:01
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type this into the sql query if your new like me, and it should come up.

SELECT * FROM wp_posts WHERE post_type = 'custom_css'

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