EjemploSection

by amenadiel

HTML

<!-- Learn about this code on MDN: https://developer.mozilla.org/es/docs/Web/CSS/::-webkit-progress-value -->

<progress id="progreso" value="10"  max="50" data-width="50%"></progress>

CSS

progress {
  width: 300px;
  border: 1px solid #ccc;
  

}

#progreso::after {
  content:'hola';
  display:block;
  width:100%;
  background:#A00;
  height:100%;
}
#progreso::before {
  content:attr(data-width)/2;
  display:block;
  width:100%;
  background:#0C0;
  height:100%;
 
}

JavaScript

window.onload =function() {
document.querySelector('#progreso').className= 'llenandose';
};