Original testing + code source found on Baymard Institue: http://baymard.com/labs/touch-keyboard-types
Disable auto-correct and disable auto-capitalization. Invoke special @ keyboard.
<input type="email" autocapitalize="off" autocorrect="off">
Invoke special phone keyboard. (Note: iOS doesn't allow input of special characters such as parenthesis and dash with the phone keyboard. Thus, never require phone numbers to be formatted with such characters.)
<input type="tel">
Disable auto-correct.
<input type="text" autocorrect="off">
Set input pattern to numeric input. (Note: Argentina, Canada, Netherlands, and UK, may use letters in their postal code. To support these, dynamically change the input pattern depending on selected country.)
<input type="text" pattern="\d*" novalidate>
Numeric keyboard.
<input type="text" pattern="\d*" novalidate autocorrect="off">
Semantic numeric keyboard.
<input type="number">
Date picker keyboard. (Note: You may want to implement an actual calendar date picker; see suggestion #7 in this Smashing Magazine article on m-commerce design.)
<input type="date">
For the 'Go' button on keyboard to work, avoid using type=button . (Thanks to Todd Gilbert for the tip.)
<input type="submit">