Angular Validator - quan1997ap/angular-app-note GitHub Wiki
function isHTML(str) {
const parser = new DOMParser();
const doc = parser.parseFromString(str, 'text/html');
return Array.from(doc.body.childNodes).some(node => node.nodeType === 1);
}
let html = '<!DOCTYPE html><html><head><title>Page Title</title></head><body><h1>This is a Heading</h1><p>This is a paragraph.</p></body></html>'
console.log(isHTML(html6))