Answers for "js span text"

change text of span js html

document.getElementById("myspan").textContent="newtext";

js add a tag inside span

var span = document.getElementById("span"); 

var a = document.createElement('a');
        a.href = "http://domain.com";
        span.appendChild(a);

javascript span containing text

const box = document.getElementById('box');

if (box.textContent.includes('five')) {
  console.log('✅ five is contained in span');
} else {
  console.log('⛔️ five is NOT contained in span');
}