HTML Tag
From SmartWiki
The HTML Tag is a setting in a custom field that allows the system administrator to change the behavior of the field.
Examples include:
Changing the Style of the Field
style="background-color:#FF0000"
style="color:#FF0000"
style="font-size:12px"
style="font-family:Verdana, Geneva, sans-serif"
style="font-weight:bold"
style="text-decoration:underline"
style="padding: 4px"
style="display: none"
For more HTML help see http://www.w3schools.com/cssref/default.asp
Displaying Other Fields on the Page Based on Value Selected in Drop-Down
See Show/Hide Header page for details.
Using onFocus
onFocus="this.value='Populate this text in field when selected.'"