Semantic HTML
The case for semantic HTML
It is easy to create HTML that works, but current best practice suggests that creating valid and Semantic HTML is an important goal for various reasons including usability and accessibility.
Unfortunately, while validation is a relatively easy task to understand and achieve, creating semantically correct HTML is a lot more subjective and open to debate.
Examples for semantic HTML
Here are some examples of non-semantic HTML taken from the current Moodle markup (layout and styling is done with CSS which isn't shown here).
List instead of DIVs
BAD:
<a href="#" name="d16">
<img id="vh_div16indicator" src="pix/closed.gif" alt="Closed folder">
Security
</a>
GOOD:
<a href="#">Security</a>
(Example taken from Moodle's Site Administration block.)
Indentation without spacer.gif
BAD:
<tbody>
</tbody>
<img class="spacer" src="pix/spacer.gif" alt="" height="10" width="20">
<a href="/course/category.php?id=3">Quizzes</a>
1
GOOD:
- <a href="/course/category.php?id=3">Quizzes</a>1
(Example from Moodle's Course Category list.)
For more examples how to make Moodle HTML more semantic you might have a look at this work in progress: Frank Ralf/Semantic HTML1.
Separating structure and styling
Don't use inline styles but put any styling information in a separate CSS.
BAD:
GOOD:
<style type="text/css">
</style>
Further resources
Online:
- Mark Pilgrim's Won’t somebody please think of the gerbils?
- An evaluation of WYSIWYG editors (including TinyMCE) for their production of valid, semantic & accessible HTML
- HTML: more structural than semantic by Simon Willison
- Million Dollar Markup by Mark Pilgrim
- Elements of Meaningful XHTML presentation by Tantek Çelik
- An index of Tantek Çelik's posts on semantic markup for blogs including
- Dan Cederholm's Simple Quiz
- But It Validates!
- Table Layouts vs. Div Layouts: From Hell to… Hell? article from Smashing Magazine
Books:
- Designing with Web Standards, 2nd ed. by Jeffrey Zeldman - This book is the single most useful source for getting you on track for writing semantic code. Highly recommended!
