I'm trying to validate my website with the W3C validator but it doesn't work. I have a YouTube iframe and this is the error:
The frameborder attribute on the iframe element is obsolete. Use CSS instead.
And this is my index.html (cropped):
<!-- Video --> <div class="video-container box-size"> <iframe width="700" height="312" src="http://www.youtube.com/embed/OfUPsnAtZMI" frameborder="0" allowfullscreen></iframe> </div>
How can I correct it?
As they state themselves "The frameborder attribute is not supported in HTML5. Use CSS instead."
The equivalent of frameborder in css is
border: 0px;. Add it to your iframe in css.