Documentation

Student-friendly HTML, CSS, and JavaScript reference with examples

Sections


                                        querySelector()


                                        querySelectorAll()


                                        .textContent


                                        .value


                                        for...of (DOM)


                                        addEventListener()


                                        'click'


                                        'input'


                                        .style


                                        .classList.add()


                                        .classList.remove()


                                        .classList.toggle()


                                        createElement()


                                        .appendChild()


                                        .remove()


                                        .parentElement


                                        .getAttribute()


                                        data-*

Finds the first element that matches a CSS selector.

const button = document.querySelector('button');
const box = document.querySelector('.box');
const header = document.querySelector('#header');

Returns the element if found, or null if no match exists.