How can give third child div within one parent div

I have one Parent div开发者_StackOverflow社区. Top of the Parent div contains two child divs. How can i give third child div below the first child div

<div class=parent1>
  <div class=child1>some text</div> /*this is in top left of the parent div */
  <div class=child2>some text</div> /*this is in top right of the parent div */
  <div class=child3>some text</div> /*how can i write css for this div come as left bottom*/

Using the css float will work if you are willing to assign a fixed width to your div's.

<style>
  div.parent1 {
    width: 800px;
  }

  .child1 {
    float: left;
    width: 400px;
  }

  .child2 {
    float: right
    width: 400px;
  }

  .child3-container {
    clear:both;
    text-align: right;
  } 

</style>

<div class=parent1>
  <div class=child1>some text</div> 
  <div class=child2>some text</div> 
  <div class='child3-container' >
    <div class=child3>some text</div> 
  </div>
</div>

You can put jQuery to use to do the job easily. Use the eq() selector of jquery to get you the desired div:

$('div#parent div:eq(1)'); // gets second div inside a div with id parent

How can i give third child div below the first child div

If I get you, you want to add another div after the first child div, you can again use eq and after selector for that:

$('div#parent div:eq(0)').after('<div>Some Content</div>');

Update:

Here is the demo I created for that

The idea is that parent div should be positioned relative and child divs absolute and then using top, left, width and height properties.