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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 |
|---|---|
| 2176 | * @since 5.2.0 Added support for `background-position` and `grid-template-columns`. |
| 2177 | * @since 5.3.0 Added support for `grid`, `flex` and `column` layout properties. |
| 2178 | * Extend `background-*` support of individual properties. |
| 2179 | * @since 5.3.1 Added support for gradient backgrounds. |
| 2180 | * @since 5.7.1 Added support for `object-position`. |
| 2181 | * @since 5.8.0 Added support for `calc()` and `var()` values. |
| 2182 | * |
| 2183 | * @param string[] $attr Array of allowed CSS attributes. |
| 2184 | */ |
| 2185 | $allowed_attr = apply_filters( |
| 2186 | 'safe_style_css', |
| 2187 | array( |
| 2188 | 'background', |
| 2189 | 'background-color', |
| 2190 | 'background-image', |
| 2191 | 'background-position', |
| 2192 | 'background-size', |
| 2193 | 'background-attachment', |
| 2194 | 'background-blend-mode', |