How the script tag closes when referencing an external script

When referencing an external script, the script tag is closed, many friends are forgetful of it, here is a description of their correct writing

When referencing an external script, the correct closing of the script label is written as follows:

The code is as follows:

<script type= "Text/javascript" src= "Js/a.js" ></script>

There is a problem with the IE11 (test, Chrome 31.0, FF 25.0 are not supported):

The code is as follows:

<script type= "Text/javascript" src= "Js/a.js"/>