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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 |
|---|---|
| 2648 | $css_array = explode( ';', trim( $css ) ); |
| 2649 | |
| 2650 | /** |
| 2651 | * Filters the list of allowed CSS attributes. |
| 2652 | * |
| 2653 | * @since 2.8.1 |
| 2654 | * |
| 2655 | * @param string[] $attr Array of allowed CSS attributes. |
| 2656 | */ |
| 2657 | $allowed_attr = apply_filters( |
| 2658 | 'safe_style_css', |
| 2659 | array( |
| 2660 | 'background', |
| 2661 | 'background-color', |
| 2662 | 'background-image', |
| 2663 | 'background-position', |
| 2664 | 'background-repeat', |
| 2665 | 'background-size', |
| 2666 | 'background-attachment', |