wp-content/themes/twentyfifteen/inc/custom-header.php:249Enqueues front-end CSS for the sidebar text color.
<?phpfunction twentyfifteen_sidebar_text_color_css() { $color_scheme = twentyfifteen_get_color_scheme(); $default_color = $color_scheme[4]; $sidebar_link_color = get_theme_mod( 'sidebar_textcolor', $default_color ); // Don't do anything if the current color is the default. if ( $sidebar_link_color === $default_color ) { return; } // If we get this far, we have custom styles. Let's do this. $sidebar_link_color_rgb = twentyfifteen_hex2rgb( $sidebar_link_color ); $sidebar_text_color = vsprintf( 'rgba( %1$s, %2$s, %3$s, 0.7)', $sidebar_link_color_rgb ); $sidebar_border_color = vsprintf( 'rgba( %1$s, %2$s, %3$s, 0.1)', $sidebar_link_color_rgb ); $sidebar_border_focus_color = vsprintf( 'rgba( %1$s, %2$s, %3$s, 0.3)', $sidebar_link_color_rgb ); $css = ' /* Custom Sidebar Text Color */ .site-title a, .site-description, .secondary-toggle:before { color: %1$s; } .site-title a:hover, .site-title a:focus { color: %2$s; } .secondary-toggle { border-color: %3$s; } .secondary-toggle:hover, .secondary-toggle:focus { border-color: %4$s; } .site-title a { outline-color: %4$s; } @media screen and (min-width: 59.6875em) { .secondary a, .dropdown-toggle:after, .widget-title, .widget blockquote cite, .widget blockquote small { color: %1$s; } .widget button, .widget input[type="button"], .widget input[type="reset"], .widget input[type="submit"], .widget_calendar tbody a { background-color: %1$s; } .textwidget a { border-color: %1$s; } .secondary a:hover, .secondary a:focus, .main-navigation .menu-item-description, .widget, .widget blockquote, .widget .wp-caption-text, .widget .gallery-caption { color: %2$s; } .widget button:hover, .widget button:focus, .widget input[type="button"]:hover, .widget input[type="button"]:focus, .widget input[type="reset"]:hover, .widget input[type="reset"]:focus, .widget input[type="submit"]:hover,Introduced in Twenty Fifteen 1.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-content/themes/twentyfifteen/inc/custom-header.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.