I don't think what you have here is an "implied language".
What you have is an "implied conversion of the HTML of a page into the Document Object Model (DOM)."
Yes, sometimes that conversion is by no means clear. As in the case of all forms being stuffed into the document.forms collection. Trust me, you will find worse (more obscure) to come.
An optimist sees the glass as half full.
A pessimist sees the glass as half empty.
A realist drinks it no matter how much there is.