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 tag defines the clickable areas inside the image map?
<map> <img> <area>
<img src="image.jpg" usemap="#map1">
<map name="map1">
  <area shape="rect" coords="9, 120, 56, 149" href="#">
  <area shape="rect" coords="100, 200, 156, 249" href="#">
</map>
Which CSS property defines what is done if the content in a box is too big for its defined space?
display overflow position
#id {
  overflow: auto;
}
Click on the event which is triggered when the mouse is positioned over an object.
onclick onmouseover onmouseout
document.getElementById("id").onmouseover = function(){
  document.write("Have Good Life");
}
Indicate the PHP variable that contains data added in URL address after the "?" character.
$_SESSION $_GET $_POST
if(isset($_GET["id"])) {
  echo $_GET["id"];
}
Making Responsive IFRAMEs

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