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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 |
|---|---|
| 48 | $lightness = absint( $lightness ) . '%'; |
| 49 | |
| 50 | /** |
| 51 | * Filter Twenty Nineteen default hover lightness level. |
| 52 | * |
| 53 | * @since Twenty Nineteen 1.0 |
| 54 | * |
| 55 | * @param int $lightness_hover Hover color lightness level. |
| 56 | */ |
| 57 | $lightness_hover = apply_filters( 'twentynineteen_custom_colors_lightness_hover', 23 ); |
| 58 | $lightness_hover = absint( $lightness_hover ) . '%'; |
| 59 | |
| 60 | /** |
| 61 | * Filter Twenty Nineteen default selection lightness level. |
| 62 | * |
| 63 | * @since Twenty Nineteen 1.0 |
| 64 | * |
| 65 | * @param int $lightness_selection Selection color lightness level. |
| 66 | */ |