Source

File: wp-includes/customize/class-wp-customize-color-control.php

public function content_template() {
		?>
		<# var defaultValue = '#RRGGBB', defaultValueAttr = '',
			isHueSlider = data.mode === 'hue';
		if ( data.defaultValue && _.isString( data.defaultValue ) && ! isHueSlider ) {
			if ( '#' !== data.defaultValue.substring( 0, 1 ) ) {
				defaultValue = '#' + data.defaultValue;
			} else {
				defaultValue = data.defaultValue;
			}
			defaultValueAttr = ' data-default-color=' + defaultValue; // Quotes added automatically.
		} #>
		<# if ( data.label ) { #>
			<span class="customize-control-title">{{{ data.label }}}</span>
		<# } #>
		<# if ( data.description ) { #>
			<span class="description customize-control-description">{{{ data.description }}}</span>
		<# } #>
		<div class="customize-control-content">
			<label><span class="screen-reader-text">{{{ data.label }}}</span>
			<# if ( isHueSlider ) { #>
				<input class="color-picker-hue" type="text" data-type="hue" />
			<# } else { #>
				<input class="color-picker-hex" type="text" maxlength="7" placeholder="{{ defaultValue }}" {{ defaultValueAttr }} />
			<# } #>
			</label>
		</div>
		<?php
	}