Live
x
<html><head><style>.important { font-weight: bold; color: red;}</style></head><body><h1>Un encabezado <span class="important">importante</span></h1><p>Este es un texto <span class="important">importante</span>.</p></body></html>
External CSS
This Pen doesn't use any external CSS resources.
External JavaScript
This Pen doesn't use any external JavaScript resources.