Some XML authors add all namespace declarations to the document's _______ element so that the namespace is available to all elements within the document.

To return to your presentation from the File tab, press ________

Fill in the blank(s) with correct word

CSS3 supports the styleopacity: value;to make any page object ____, where value ranges from 0 up to 1.

A. transparent B. semi-transparent C. linear gradient D. color gradient