I am trying to change text to bold, which is really hard. I tried many times using various ways, for example:

//1: 

document.getElementById('boldtext').innerHTML = "<b>" += document.getElementById('boldtext').innerHTML += "</b>"; //which dosent work

//2:

document.getElementById('boldtext').bold(); //dosent work too

Any ideas on how to bold text in Javascript?

//My code so far:
The whole code is this: function getSelectionText() { var text = ""; if (window.getSelection) { text = window.getSelection().toString(); } else if (document.selection && document.selection.type != "Control") { text = document.selection.createRange().text; } alert(text); }; let BoldButton = document.createElement('input'); /*boldbuttonlol*/ BoldButton.type = 'button'; BoldButton.value = 'bold highlighted text'; BoldButton.onclick = () => { getSelectionText(); }; document.body.appendChild(BoldButton); 

Thank you!!