Best Cheat Sheet:
https://websitesetup.org/wp-content/uploads/2020/09/Javascript-Cheat-Sheet.pdf/* Convenient interactive cheat sheet */ 'https://htmlcheatsheet.com/js/'
/* PDF VERSION */'https://websitesetup.org/wp-content/uploads/2020/09/Javascript-Cheat-Sheet.pdf'// Returns a reference to the element by its ID.
document.getElementById('someid');
// Returns an array-like object of all child elements which have all of the given class names.
document.getElementsByClassName('someclass');
// Returns an HTMLCollection of elements with the given tag name.
document.getElementsByTagName('LI');
// Returns the first element within the document that matches the specified group of selectors.
document.querySelector('.someclass');
// Returns a list of the elements within the document (using depth-first pre-order traversal of the document's nodes)
// that match the specified group of selectors.
document.querySelectorAll('div.note, div.alert');