Get the equivalent of 100vh, which is not always the same as window.innerHeight (see article linked in JSDoc comment)

getFullVh.js

/** Get the equivalent of 100vh, which is not always the same as window.innerHeight (see article linked in JSDoc comment)
 *
 * https://developers.google.com/web/updates/2016/12/url-bar-resizing
 *
 * You'll also need to put this in the top-level of the `body` element:
 * ```html
 * <!-- See: `getFullVh()` -->
 * <div style="overflow: hidden; height: 0">
 *   <div id="measure-vh" style="position: fixed; height: 100vh"></div>
 * </div>
 * ```
 */
const getFullVh = () => {
  return document.querySelector('#measure-vh').clientHeight
}