Need to check your newly written HTML5 page to ensure you've used and titled all of your elements correctly as is required by HTML5? Well, there's one simple way to do that and that's by making use of HTML5 Outliner.
Not only does it outline all your sections, it also gives you a hierarchical view of your document. The output should be something like this if you're coding your documents correctly.
1. This is a section 1.And this a subsection!