gtk-css-provider-load-from-file (provider file)

provider -- a gtk-css-provider object
file -- a g-file object pointing to a file to load

True. The return value is deprecated and false will only be returned for backwards compatibility reasons if an error occured.

Loads the data contained in file into the CSS provider, making it clear any previously loaded information. To track errors while loading CSS, connect to the "parsing-error" signal of the gtk-css-provider object.