Look over Javascript Basics
Web-crawlers update their indices if your title changes, as a heads-up note.
let variable = "-hello world-";
document.title = "___/TEXT :: TEXT: " + variable + " \ _________";
console.log(document.title);
/*
OR
document.title = "___/TEXT :: TEXT: var \ _________";
document.title = document.title.replace('var', variable);
*/
5
solved How to display a dynamic variable in the title of an html page?