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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 |
|---|---|
| 2297 | $css_array = explode( ';', trim( $css ) ); |
| 2298 | |
| 2299 | /** |
| 2300 | * Filters the list of allowed CSS attributes. |
| 2301 | * |
| 2302 | * @since 2.8.1 |
| 2303 | * |
| 2304 | * @param string[] $attr Array of allowed CSS attributes. |
| 2305 | */ |
| 2306 | $allowed_attr = apply_filters( |
| 2307 | 'safe_style_css', |
| 2308 | array( |
| 2309 | 'background', |
| 2310 | 'background-color', |
| 2311 | 'background-image', |
| 2312 | 'background-position', |
| 2313 | 'background-size', |
| 2314 | 'background-attachment', |
| 2315 | 'background-blend-mode', |