Proof of concept for changing alt tags/title tags on hover dynamically it gets picked up automatically by browsers and displayed as the usual “alt/title tooltip”. There is obviously no benefit to SEO using this but was good to prove it works. Check out me fiddle below.


Browser support:
Latest chrome – yes
Latest firefox – yes
IE9 – yes
IE8 – ??

Sam Deering Sam Deering
Sam Deering is a Front-end Web Developer who specialises in JavaScript & jQuery. Sam is driven and passionate about sharing his knowledge to educate others.

  • Andy Harvey

    This markup could be simplyfied with the use of html5 attribute data-*

    For example: 3
    And using jQuery like this: $(‘span[data-dynalt]’);

    Just an idea.

    • Andy Harvey

      My markup disappeared. Retry :


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