CSS Overflow Tutorial

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1- CSS Overflow

When the content of an element is larger than the space provided by the element, the content may overflow. CSS overflow allows you to set up element behavior in this case. 
Note: CSS overflow works with only the block elements that are specified a specific height.
The possible values of  CSS overflow:
  • visible
  • hidden
  • scroll
  • auto

2- CSS {overflow: visible}

CSS {overflow: visible}: (Default). If the content of the element is larger than the space provided by the element, it will overflow, which is the default behavior. 
overflow-visible-example.html
<!DOCTYPE html>
<html>
   <head>
      <title>CSS overflow</title>
      <meta charset="UTF-8"/>

      <style>
         div {
           background-color: #d6eaf8;
           padding: 5px;
           margin-top: 10px;
         }
      </style>

   </head>
   <body>
       <h1>CSS {overflow:visible} (Default)</h1>
       <hr/>

       <div style="width: 200px; height: 100px; overflow: visible">
             Michaelmas term lately over, and the Lord Chancellor
             sitting in Lincoln's Inn Hall. Implacable November weather.
             As much mud in the streets as if the waters
             had but newly retired from the face of the earth.
       </div>
   </body>
</html>

3- CSS {overflow: hidden}

CSS {overflow: hidden}: The content overflowing the space of element will be hidden.
overflow-hidden-example.html
<!DOCTYPE html>
<html>
   <head>
      <title>CSS overflow</title>
      <meta charset="UTF-8"/>

      <style>
         div {
           background-color: #d6eaf8;
           padding: 5px;
           margin-top: 10px;
         }
      </style>

   </head>
   <body>
       <h1>CSS {overflow:hidden}</h1>
       <hr/>

       <div style="width: 200px; height: 100px; overflow: hidden">
             Michaelmas term lately over, and the Lord Chancellor
             sitting in Lincoln's Inn Hall. Implacable November weather.
             As much mud in the streets as if the waters
             had but newly retired from the face of the earth.
       </div>
   </body>
</html>

4- CSS {overflow: scroll}

CSS {overflow: scroll}: The browser will create a scroll bar for element. Users can use the scroll bar to view the remaining contents. 
Note: For most browsers and operating systems, an element's scroll bar always appears even when the content of the element is less than the space provided by the element. Exceptions occur with Mac OSX Lion, scroll bars appear only when necessary.
overflow-scroll-example.html
<!DOCTYPE html>
<html>
   <head>
      <title>CSS overflow</title>
      <meta charset="UTF-8"/>

      <style>
         div {
           background-color: #d6eaf8;
           padding: 5px;
           margin-top: 10px;
         }
      </style>

   </head>
   <body>
       <h1>CSS {overflow:scroll}</h1>
       <hr/>

       <div style="width: 200px; height: 100px; overflow: scroll">
             Michaelmas term lately over, and the Lord Chancellor
             sitting in Lincoln's Inn Hall. Implacable November weather.
             As much mud in the streets as if the waters
             had but newly retired from the face of the earth.
       </div>
   </body>
</html>

5- CSS {overflow: auto}

CSS {overflow: auto}: Similar to 'scroll', but scroll bar appears only when the content is larger than the space that the element provides.
overflow-auto-example.html
<!DOCTYPE html>
<html>
   <head>
      <title>CSS overflow</title>
      <meta charset="UTF-8"/>

      <style>
         div {
           background-color: #d6eaf8;
           padding: 5px;
           margin-top: 10px;
         }
      </style>

   </head>
   <body>
       <h1>CSS {overflow:auto}</h1>
       <hr/>

       <div style="height: 105px; overflow: auto">
             Michaelmas term lately over, and the Lord Chancellor
             sitting in Lincoln's Inn Hall. Implacable November weather.
             As much mud in the streets as if the waters
             had but newly retired from the face of the earth.
             <br/>
             Michaelmas term lately over, and the Lord Chancellor
             sitting in Lincoln's Inn Hall. Implacable November weather.
             As much mud in the streets as if the waters
             had but newly retired from the face of the earth.
       </div>
   </body>
</html>

6- CSS overflow-x, overflow-y

Instead of using CSS overflow you can use CSS overflow-x and  CSS overflow-y. The possible values of CSS overflow-x, CSS overflow-y are the same as  CSS overflow.
  • visible
  • hidden
  • scroll
  • auto

CSS overflow-x

CSS overflow-x is used to set up element behavior when its content overflows horizontally.

CSS overflow-y

CSS overflow-y is used to set up element behavior when its content overflows vertically.
Note: You can specify a value pair for (overflow-x,overflow-y), but the browser will recalculate this value pair, because the value pair specified by you can not be real. For example,  (visible, hidden)  will be recalculated into  (scroll, hidden)
The following table contains 2 columns. The first column contains the value pairs you specify. The second column contains the value pairs that the browser has recalculated.
Specified values Computed values
(visible, visible) (visible, visible)
(visible, hidden) (scroll, hidden)
(visible, scroll) (scroll, scroll)
(visible, auto) (scroll, auto)
 
(hidden, visible) (hidden, scroll)
(hidden, hidden) (hidden, hidden)
(hidden, scroll) (hidden, scroll)
(hidden, auto) (hidden, auto)
 
(scroll, visible) (scroll, scroll)
(scroll, hidden) (scroll, hidden)
(scroll, scroll) (scroll, scroll)
(scroll, auto) (scroll, auto)
 
(auto, visible) (auto, scroll)
(auto, hidden) (auto, hidden)
(auto, scroll) (auto, scroll)
(auto, auto) (auto, auto)
overflow-x-y-example.js
function changeOverflowX(event) {
   value = event.target.value;
   var myDiv = document.getElementById("myDiv");
   myDiv.style.overflowX = value;
}

function changeOverflowY(event) {
   value = event.target.value;
   var myDiv = document.getElementById("myDiv");
   myDiv.style.overflowY = value;
}
overflow-x-y-example.html
<!DOCTYPE html>
<html>
   <head>
      <title>CSS overflow</title>
      <meta charset="UTF-8"/>
      <style>
         #myDiv  {
           background-color: #d6eaf8;
           padding: 5px;
           margin-top: 15px;
         }
      </style>
      <script src="overflow-x-y-example.js"> </script>
   </head>
   <body>
       <h2>CSS overflow-x, overflow-y</h2>
       <hr/>
       <div style="display: inline-block; width: 150px;">
         <p>Overflow-x:</p>
         <input type="radio" name="overflowX" value="visible" onClick="changeOverflowX(event)" checked/> Visible <br/>
         <input type="radio" name="overflowX" value="hidden" onClick="changeOverflowX(event)"/> Hidden <br/>
         <input type="radio" name="overflowX" value="scroll" onClick="changeOverflowX(event)"/> Scroll <br/>
         <input type="radio" name="overflowX" value="auto" onClick="changeOverflowX(event)"/> Auto <br/>
       </div>

       <div style="display: inline-block; width: 150px;">
         <p>Overflow-y:</p>
         <input type="radio" name="overflowY" value="visible" onClick="changeOverflowY(event)" checked/> Visible <br/>
         <input type="radio" name="overflowY" value="hidden" onClick="changeOverflowY(event)"/> Hidden <br/>
         <input type="radio" name="overflowY" value="scroll" onClick="changeOverflowY(event)"/> Scroll <br/>
         <input type="radio" name="overflowY" value="auto" onClick="changeOverflowY(event)"/> Auto <br/>
       </div>

       <div id="infoDiv">

       </div>

       <div id="myDiv" style="height: 50px; width:200px; overflow-x: visible;">

           The value of Pi is <br/>
           3.1415926535897932384626433832795029.

           The value of e is <br/>

           2.718281828459045235360287471352662

       </div>
   </body>
</html>

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