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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 |
|---|---|
| 2168 | * @since 5.0.0 Added support for `background-image`. |
| 2169 | * @since 5.1.0 Added support for `text-transform`. |
| 2170 | * @since 5.2.0 Added support for `background-position` and `grid-template-columns`. |
| 2171 | * @since 5.3.0 Added support for `grid`, `flex` and `column` layout properties. |
| 2172 | * Extend `background-*` support of individual properties. |
| 2173 | * @since 5.3.1 Added support for gradient backgrounds. |
| 2174 | * |
| 2175 | * @param string[] $attr Array of allowed CSS attributes. |
| 2176 | */ |
| 2177 | $allowed_attr = apply_filters( |
| 2178 | 'safe_style_css', |
| 2179 | array( |
| 2180 | 'background', |
| 2181 | 'background-color', |
| 2182 | 'background-image', |
| 2183 | 'background-position', |
| 2184 | 'background-size', |
| 2185 | 'background-attachment', |
| 2186 | 'background-blend-mode', |