definitively useful, but some feedback:

+ Need a way to do an explicit search. There are a lot of shorthand properties and searching for "border" requires me to scroll way down to find the border reference doc. If I typed border: it should only show me one result.

+ The possible values need to be presented in a list. It is difficult to scan that paragraph to determine what are my options.

+ Make the search box position fixed. Maybe in the header? If no input is present in the search input, show the howto below. Make sure to add a background color to the howto to distinguish from results.