css - javascript how to select elements and style it -

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may know how build css style parser/evaluator in javascript below:

.book { width: calc(200px + 400px); } .book h1 { font-size: 10em; } div.book { color: blue; } .book.green { background: green; } .book[name="hello"] { color: pink; } .book[data-name="hi"], .other-book { color: red; } .book > { text-decoration: none; } .book a:nth-child(2) { color: purple; }

document.getelementsbyclassname('box') returns collection. should specify specific index inside square brackets this

document.getelementsbyclassname('box')[0].style.width = '100px';

this has difference between classes , ids. there can multiple elements same class name, ids unique. same formula as

document.getelementbyid

does not work classes, because of difference mentioned above.

although, best done through css.


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