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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 |
|---|---|
| 32 | $saturation_selection = absint( apply_filters( 'twentynineteen_custom_colors_saturation_selection', 50 ) ); |
| 33 | $saturation_selection = $saturation_selection . '%'; |
| 34 | |
| 35 | $lightness = absint( apply_filters( 'twentynineteen_custom_colors_lightness', 33 ) ); |
| 36 | $lightness = $lightness . '%'; |
| 37 | |
| 38 | $lightness_hover = absint( apply_filters( 'twentynineteen_custom_colors_lightness_hover', 23 ) ); |
| 39 | $lightness_hover = $lightness_hover . '%'; |
| 40 | |
| 41 | $lightness_selection = absint( apply_filters( 'twentynineteen_custom_colors_lightness_selection', 90 ) ); |
| 42 | $lightness_selection = $lightness_selection . '%'; |
| 43 | |
| 44 | $theme_css = ' |
| 45 | /* |
| 46 | * Set background for: |
| 47 | * - featured image :before |
| 48 | * - featured image :before |
| 49 | * - post thumbmail :before |
| 50 | * - post thumbmail :before |