[whatwg] Hide placeholder on input controls on focus

[Markus Ernst]

Am 21.03.2013 12:10 schrieb James Ross:
> Just as an added data-point (that I only noticed today) - Windows 7's placeholder implementation in the Start menu and Explorer's search box:
>   - Focusing the input box with tab/Control-E or autofocus when opening the Start menu does *not* hide the placeholder.
>   - Control-A or clicking in the textbox hides the placeholder.

I was not aware of the possibility to distinguish between clicking in a 
textbox and other ways to focus it. This behaviour seems to be very 
user-friendly to me.