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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 |
|---|---|
| 1725 | * Filters list of allowed CSS attributes. |
| 1726 | * |
| 1727 | * @since 2.8.1 |
| 1728 | * @since 4.4.0 Added support for `min-height`, `max-height`, `min-width`, and `max-width`. |
| 1729 | * @since 4.6.0 Added support for `list-style-type`. |
| 1730 | * @since 5.0.0 Added support for `background-image`. |
| 1731 | * |
| 1732 | * @param array $attr List of allowed CSS attributes. |
| 1733 | */ |
| 1734 | $allowed_attr = apply_filters( 'safe_style_css', array( |
| 1735 | 'background', |
| 1736 | 'background-color', |
| 1737 | 'background-image', |
| 1738 | |
| 1739 | 'border', |
| 1740 | 'border-width', |
| 1741 | 'border-color', |
| 1742 | 'border-style', |
| 1743 | 'border-right', |