Remova o atributo JavaScript
document.getElementsByTagName("H1")[0].removeAttribute("class");
Pratik Patel
document.getElementsByTagName("H1")[0].removeAttribute("class");
var target = document.getElementById("p12");
target.removeAttribute("class");
var person = {
name: "Harry",
age: 16,
gender: "Male"
};
// Deleting a property completely
delete person.age;
alert(person.age); // Outputs: undefined
console.log(person); // Prints: {name: "Harry", gender: "Male"}