2.1.456 Part 4 Section 18.104.22.168, optimizeForBrowser (Disable Features Not Supported by Target Web Browser)
a. The standard states that the values off, 0, and false on the val attribute specify that the property shall be explicitly turned off.
Word treats all values on this attribute as equivalent to the value on.
This note applies to the following products: 2007, 2007 SP1.
b. The standard states that this element (in conjunction with the other elements listed) is used to set the target web browser.
Word does not use the indicated settings to determine target browser when document is loaded, instead using Internet Explorer 6 as the target browser in every case.