If viewing the styles property/value list on a wide display, the checkbox can be quite the distance from the actual property/value. It should be more distinct which checkbox goes with which property. There is a title text box, but that doesn't provide a response as timely as a visual que. This could be accomplished by either faintly highlighting across the line on mouse over, or placing the checkbox to the left of the property. I think the checkbox to the left of the property would be more intuitive. Just like when someone goes over a list on a piece of paper and follow the items with their finger, one usually uses the cursor in the same manner when looking through a list, because of this, the cursor would be closer to the left side of the items. If this was done, then the title text could be removed entirely. That title text actually poses a bit problem if you're trying to read the properties and keep track of where you are with the cursor, when it pops up, it obscures the properties around the cursor.
Checkboxes have been moved to the left.