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is contained within the normal comment syntax. Browsers which do not support conditional
comments will simply ignore them and display the rest of the content between them.

<!--[if IE]>-->
The HTML inside this comment is revealed in IE 5-9, and in all other browsers.
<!--<![endif]-->

<!--[if IE 9]>-->
This is revealed in specified versions of IE 5-9, and in all other browsers.
<!--<![endif]-->

<!--[if !IE]>-->
This is not revealed in IE 5-9. It's still revealed in other browsers.
<!--<![endif]-->

Commenting out whitespace between inline elements

Inline display elements, usually such as span or a, will include up to one white-space character
before and after them in the document. In order to avoid very long lines in the markup (that are
hard to read) and unintentional white-space (which affects formatting), the white-space can be
commented out.

<!-- Use an HTML comment to nullify the newline character below: -->
<a href="#">I hope there will be no extra whitespace after this!</a><!--
--><button>Foo</button>

Try it without a comment between the inline elements, and there will be one space between them.
Sometimes picking up the space character is desired.

Example code:

<!-- Use an HTML comment to nullify the newline character below: -->
<a href="#">I hope there will be no extra whitespace after this!</a><!--
--><button>Foo</button>
<hr>
<!-- Without it, you can notice a small formatting difference: -->
<a href="#">I hope there will be no extra whitespace after this!</a>
<button>Foo</button>

Output:

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