An Extensive Guide To Web Form Usability
uxdesign.smashingmagazine.com
NOVEMBER 17, 2011
Colons at the end of labels UI guidelines for some desktop applications and operating systems such as Windows recommend adding colons at the end of form labels. Learn more on Coding: JavaScript & jQuery. As for phone number / SSN / zip code, I use single field of appropriate length, with Label and help text / hint (numbers only).
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