This html and css code can be used for making an iframe responsive, both width and height, that works in modern browser; in desktop and mobile devices. - HTML:
<div class="youtube">
 <iframe src="https://www.youtube.com/embed/x1USgMp9__s?autoplay=0"></iframe>
</div>
- CSS:
.youtube {
margin:8px auto 5px auto;
position:relative;
padding-bottom:12%;
padding-top:100px;
height:0;
overflow: auto; 
-webkit-overflow-scrolling:touch;
text-align:center;
width:99%;
max-width:600px;
min-width:300px;
min-height:205px;
}
.youtube iframe {
border:0;
display:block;
margin:0 auto;
position:absolute;
top:0;
left:0;
width:100%;
height:100%;
max-height:420px;
min-height:200px;
}

Daily Test with Code Example

HTML
CSS
JavaScript
PHP-MySQL
Which attribute is used in <img> tag for the address of the image?
href src rel
<img src="http://coursesweb.net/imgs/webcourses.gif" width="191" height="63" alt="Courses-Web" />
Which CSS code hides the element on page?
display: none; display: inline; position: relative;
#id {
  display: none;
}
What instruction stops the execution of a while() or for() statement?
continue prompt() break
for(var i = 0; i< 8; i++) {
  if(i > 1) break;
  alert(i);
}
Indicate the function that can create a constant.
define() include() defined()
define("CONSTANT_NAME", "value");
echo CONSTANT_NAME;
Making Responsive IFRAMEs

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