EjemploSection

by amenadiel

HTML

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

<progress id="progreso"  ></progress>

CSS

progress {
  width: 300px;
  border: 1px solid #ccc;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
}


progress::-moz-progress-bar {
  background:#36c;
  width:0;
  transition: width 2s linear; 
}
progress::-webkit-progress-bar {
  background:#36c;
  width:0;
  transition: width 2s linear; 
}

.llenandose::-webkit-progress-bar {
  width:100%;
}
.llenandose::-moz-progress-bar {
  width:100%;
}

JavaScript

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