Type tree for representing Elm's Html

• TextTag is just a plain old bit of text.
• NodeEntry is an actual HTML node, e.g a div
• CustomNode are nodes defined to work with the renderer in some way, e.g webgl/markdown
• MarkdownNode is just a wrapper for CustomNode designed just for markdown

Text tags just contain text

A node contains the tag as a string, the children, the facts (e.g attributes) and descendantsCount

Custom nodes contain facts (e.g attributes) and a json value for the model

A markdown node contains facts (e.g attributes) and the model used by markdown

Facts contain various dictionaries and values for a node

• styles are a mapping of rules
• events may be a json object containing event handlers
• attributes are pulled out into stringAttributes and boolAttributes - things with string values go into stringAttributes, things with bool values go into boolAttributes

decode a json object into ElmHtml

Just empty facts