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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 2322 | $css_array = explode( ';', trim( $css ) ); |
| 2323 | |
| 2324 | /** |
| 2325 | * Filters the list of allowed CSS attributes. |
| 2326 | * |
| 2327 | * @since 2.8.1 |
| 2328 | * |
| 2329 | * @param string[] $attr Array of allowed CSS attributes. |
| 2330 | */ |
| 2331 | $allowed_attr = apply_filters( |
| 2332 | 'safe_style_css', |
| 2333 | array( |
| 2334 | 'background', |
| 2335 | 'background-color', |
| 2336 | 'background-image', |
| 2337 | 'background-position', |
| 2338 | 'background-repeat', |
| 2339 | 'background-size', |
| 2340 | 'background-attachment', |