Inject custom markup in the website while creating a screenshot with CLI (command line) using https://github.com/sindresorhus/capture-website-cli

inject-custom-markup.js

window.onload = function() {
	var x = document.querySelectorAll("h1");
  	x[1].innerHTML = "Mahesh Waghmare";
	var x = document.querySelectorAll(".subheading");
  	x[1].innerHTML = "This Screenshot is generated with `capture-website-cli`. And also the string \"Mahesh Waghmare\" and this paragraph both are also injected with the JavaScript while creating https://wordpress.org/ web page screenshot.";
};