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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 |
|---|---|
| 2383 | $css_array = explode( ';', trim( $css ) ); |
| 2384 | |
| 2385 | /** |
| 2386 | * Filters the list of allowed CSS attributes. |
| 2387 | * |
| 2388 | * @since 2.8.1 |
| 2389 | * |
| 2390 | * @param string[] $attr Array of allowed CSS attributes. |
| 2391 | */ |
| 2392 | $allowed_attr = apply_filters( |
| 2393 | 'safe_style_css', |
| 2394 | array( |
| 2395 | 'background', |
| 2396 | 'background-color', |
| 2397 | 'background-image', |
| 2398 | 'background-position', |
| 2399 | 'background-repeat', |
| 2400 | 'background-size', |
| 2401 | 'background-attachment', |