Shame it wraps the CSS in that cargo cult <!-- --> nonsense. This was kinda useful for a few browsers in the mid-1990s, but is actively harmful today.

In XML DTDs (including the DTD for XHTML 1.1), there is no mechanism to specify that the content model for an element is CDATA. Thus the <!-- --> acts as a genuine XML comment, and causes the style sheet contained within it to be commented out and totally ignored.

If a browser is in HTML mode (i.e. you serve the page using Content-Type: text/html) you won't notice this, but as soon as you switch to Content-Type: application/xhtml+xml all your styles will disappear.

Illustration...

<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <title>CSS demo</title>
    <style type="text/css">      p      { color: green }  </style>
    <style type="text/css"><!--  p.mine { color: red } --></style>
  </head>
  <body>
    <p class="mine">This should be green.</p>
  </body>
</html>

[download]

The above, viewed in a standards compliant browser, in XHTML mode, will show a green paragraph. The CSS which sets it to red is commented out and ignored.

In reply to Re^2: CSV or HTML? by tobyink
in thread CSV or HTML? by jms53

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.