The submit button in the iframe should be a button, not an anchor

[rlacorne]

Right now, the submit button within hpm2's iframe is an Anchor tag. (<a>)

This is a very bad pattern for accessibility, as visually impaired users will read this as being a link, while for all intents and purposes, it only manages javascript functions. It should therefore be a <button> to make sure the user understands what they are activating and cognitively understand the expected behavior.