Basic Icon
An Icon is an inline SVG element. <svg class="e-bolt-icon"> is acceptable at rendering an icon, though the Twig template is the recommended usage for Drupal.
Important Notes:Icon element is a replacement for the Icon component.When writing inline SVG manually using <svg> HTML element, be sure to minifiy the SVG, add the element class class="e-bolt-icon", and add the attribute aria-hidden="true".Icon element can be used in tandem with Shape element to create a square or circle container around the icon. In such scenario, size and color should not be set on the Icon, they should be set on the Shape instead.