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Change the display order of content on an HTML page just by adding querystring parameters to its URL
Dynamically prevent text orphans by enforcing a minimum number of words in the last line of any text block
Prevent users from entering an expired credit card month/year combination, by using the current date to disable options that occur in the past
Add a subtle "barbershop pole" stripe animation to progress bars. Gracefully degrades in older browsers that don't support CSS3 animation and/or linear gradients (the stripes will appear without mo…
Request the user's location and then prepopulate their address in a form
Display a live countdown clock
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