Periodic Table of HTML5 Elements
The table shows all valid elements in the current HTML 5 specification. They are grouped and coloured based on their “Content Model” i.e. what type of element it may contain. Items shown with red text have complex requirements but are shown alongside elements with similar content models. Unlike the Mendelevian Periodic Table that is used in Chemistry, there is no fundamental ordering to the elements within a group, and no significance to the presence of a few empty spaces.