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Tuesday, April 13, 2010

HTML, CSS, Java script comments

While working on this blog, I have realized that there are at lest three different ways to insert a comment on a HTML web page.

1) HTML comments
<!--This is a comment. Comments are not displayed in the browser-->

The tricky part was to find out how to visualize this comment on the webpage, something that is not supposed to show-up! . The solutions comes down to this table

ResultDescriptionEntity NameEntity Number
non-breaking space&nbsp;&#160;
<less than&lt;&#60;
>greater than&gt;&#62;
®registered trademark&reg;&#174;

As per above table, the HTML code necessary to show up HTML comments is

&lt;!-- This is a comment. Comments are not displayed in the browser --&gt;

Now the problem is- How do we visualize &lt; ?
In this case we just need to write in the HTML source page:

2) CSS comment
    /*  comment here */
3) Java script comment
    // Comment here

Here you can find few examples from my HTML template page

The Jave script is commented becasue is delimited by <!--    -->
Whithin the Jave script code you can find additional comments  //
In the CSS body element, you can find CSS comments /*   */


 <script src='' type='text/javascript'>  //
  //  This script call is what gets MathJax loaded and running
    jax: ["input/TeX","output/HTML-CSS"],    // input is TeX and output is HTML-CSS format
    extensions: ["tex2jax.js"],              // use the tex2jax preprocessor
    tex2jax: {
//    inlineMath: [['$','$'],['\\(','\\)']], // uncomment to use $...$ for inline math
      processEscapes: 1                      // set to 1 to allow \$ to produce a dollar sign


body {

/*  background:$bgcolor; */ /* old code */
  background:#d0e4fe; /* new code */
  font:x-small Georgia Serif;
  font-size/* */:/**/small;
  font-size: /**/small;
  text-align: center;

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