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 adds a new line into a paragraph?
<b> <br> <p>
First line ...<br>
Other line...
Which CSS property can be used to add space between letters?
text-size word-spacing letter-spacing
#id {
  letter-spacing: 2px;
}
What JavaScript function can be used to get access to HTML element with a specified ID?
getElementById() getElementsByTagName() createElement()
var elm = document.getElementById("theID");
var content = elm.innerHTML;
alert(content);
Click on the "echo" correct instruction.
echo "CoursesWeb.net" echo "CoursesWeb.net"; echo ""CoursesWeb.net";
echo "Address URL: http://CoursesWeb.net";
Making Responsive IFRAMEs

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