Displays all global variables created by the current page.

show-page-created-global-variables.js

(() => {
  const iframe = document.createElement('iframe')
    iframe.style.display = 'none'
    document.body.appendChild(iframe)

    const currentWindow = Object.getOwnPropertyNames(window)  

    const results = currentWindow.filter(prop => !iframe.contentWindow.hasOwnProperty(prop))

    console.log(results)
    document.body.removeChild(iframe)
})()