mc:Ignorable attribute in Windows Phone XAML Page

When a new Windows Phone Project is created, it creates the MainPage.xaml by default. This page contains the attribute

mc:Ignorable=”d”

This is an attribute which indicates to the compiler to ignore any other attributes that starts with “d”.

For example, the attributes d: DesignHeight or d: DesignWidth is a typical example of the compiler ignoring the height and width attributes.

These attributes are only used by the IDE to render the page at design time.