function persistHash (here) {
  ensureDomLoaded(() => {
    document
      .querySelectorAll('form[action]')
      .forEach(e => (e.action += '#' + here))
    document.querySelectorAll('a[href]').forEach(e => (e.href += '#' + here))
  })
}
Adds a hash to all forms and links on the page.
@param {String} h - The hash to add