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

provider -- a gtk-css-provider object
data -- a string with the CSS data

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

Loads data 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.