The question is why developers even want to contaminate markup with programming constructs when they have already everything they could ask for, including an ob

The question is why developers even want to contaminate markup with programming constructs when they have already everything they could ask for, including an object literal syntax ("JSON") for arbitrary graphs that also can encode a DOM. SGML (XML, HTML) is for content (text) authors not developers, but webdevs just don't get it and look at it as a solution to developer problems.