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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 |
|---|---|
| 2070 | * @since 4.6.0 Added support for `list-style-type`. |
| 2071 | * @since 5.0.0 Added support for `background-image`. |
| 2072 | * @since 5.1.0 Added support for `text-transform`. |
| 2073 | * @since 5.2.0 Added support for `background-position` and `grid-template-columns` |
| 2074 | * @since 5.3.0 Added support for `grid`, `flex` and `column` layout properties. |
| 2075 | * Extend `background-*` support of individual properties. |
| 2076 | * |
| 2077 | * @param string[] $attr Array of allowed CSS attributes. |
| 2078 | */ |
| 2079 | $allowed_attr = apply_filters( |
| 2080 | 'safe_style_css', |
| 2081 | array( |
| 2082 | 'background', |
| 2083 | 'background-color', |
| 2084 | 'background-image', |
| 2085 | 'background-position', |
| 2086 | 'background-size', |
| 2087 | 'background-attachment', |
| 2088 | 'background-blend-mode', |