Many developers know that if you change the style.css of a theme, and then the theme gets updated, your changes will be deleted.

The traditional solution for that is creating a child theme inheriting everything from the parent theme, while changing the child theme's CSS.

But what about a case when I change the CSS of a theme from Wordpress itself, as can be done from the Wordpress customizer?

Will this CSS also be changed if the theme is updated? I would bet it won't 99.99% but it wasn't clear from any documentation I've read so far.


The mods you enter into the Customizer are kept safe over upgrades, as they are saved into the database. But styles are not the only reason for a need of a child theme. Often you need to add functions/hooks and several other customiziation which - in that case - need a specific child theme.

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