[whatwg] Undefined action parsing HTML fragment with context

Hello! I am confused about parsing an HTML fragment when the context is a "select" element. http://www.whatwg.org/specs/web-apps/current-work/multipage/the-end.html#parsing-html-fragments step 4.6 instructs me to "reset the parser's insertion mode appropriately". I head over to http://www.what

[whatwg] HTML tree construction, inserting a foreign element, and foster parenting

Hello! I've a question about the HTML spec. Suppose I'm parsing the following markup: My question is: when I insert an element for the start tag token named "math", is it affected by the foster parenting logic? To explain further, I get confused during tree construction when I reach the star