HTML comments tags
HTML Comments overview and example script
Similar to another programming, markup, and markdown languages, comments in HTML provide other developers with development specific information without affecting the user interface. Unlike other languages, however, HTML comments can be used to specify HTML elements for Internet Explorer only. This topic explains how to write HTML comments and their functional applications.
A comment is a piece of code that is ignored by any web browser. It is a good practice to add comments into your HTML code, especially in complex documents, to indicate sections of a document, and any other notes to anyone looking at the code. Comments help you and others understand your code and increase code readability. HTML comments are placed in between <!-- ... --> tags. So, any content placed with-in <!-- ... --> tags will be treated as comments and will be completely ignored by the browser.
Valid vs Invalid Comments
Comments do not nest which means a comment cannot be put inside another comment. Second the double-dash sequence "--" may not appear inside a comment except as part of the closing --> tag. You must also make sure that there are no spaces in the start-of comment string.
Here, the given comment is a valid comment and will be wiped off by the browser.
But, the following line is not a valid comment and will be displayed by the browser. This is because there is a space between the left angle bracket and the exclamation mark.
So far we have seen single-line comments, but HTML supports multi-line comments as well. You can comment multiple lines by the special beginning tag <!-- and ending tag --> placed before the first line and end of the last line as shown in the given example below.
Multiple comments example:
Conditional comments only work in Internet Explorer (IE) on Windows but they are ignored by other browsers. They are supported from Explorer 5 onwards, and you can use them to give conditional instructions to different versions of IE.
Condition comments example :
Using Comment Tag
There are few browsers that support <comment> tag to comment a part of HTML code.
Comment tag example :
Commenting Script Code
Commenting script code
Commenting Style Sheets
Though you will learn to use style sheets with HTML in a separate tutorial, here you must make a note that if you are using Cascading Style Sheet (CSS) in your HTML code then it is recommended to put that style sheet code inside proper HTML comments so that old browser can work properly.
Commenting style sheet example :
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