html - why html5 is used necessarily? -

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this question has answer here:

i'm surprisingly amazed @ following codes found in joomla2.5 template: beez5

<?php if(!$templateparams->get('html5', 0)): ?>         <div id="header">             <?php else: ?>         <header id="header">             <?php endif; ?>

yeah! it's age of html5 code asking if browser supports html5 add <header id="header"> tag otherwise add <div id="header">. why template not using <div id="header"> instead of both?

question: difference between old markup <div id="header"> , new markup <header id="header">? if browsers supports html5, behaves differently <div id="header"> when using <header id="header">?

php server side language, not checking @ client level, @ server.

html 5 more semantically correct, using <header> rather using <div> id header provides better seo, easier web crawlers find, , provides better accessibility (i.e. screen reader or other device can relate headers, footers, sections represent).


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