Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript JavaScript and the DOM (Retiring) Getting a Handle on the DOM Using CSS Queries to Select Page Elements

5,042 Points

Why are brackets needed in document.querySelector('[title=label]') ?

Mark 2:32 he says to search an html element by searching for the title attribute 'label.' In this scenario, square brackets [ ] are needed. Why are brackets needed in this example, but not in the others?

1 Answer

Jimmy Crandall
Jimmy Crandall
23,120 Points

The square brackets are required in this example because Document.querySelector() finds an HTML Element based on a CSS selector.

This specific example uses an Attribute Selector. The CSS syntax for an Attribute Selector requires you to use square brackets as follows:

/* Represents elements with an attribute name of `attr` whose value is exactly `val`. */

Hope this helps! Those MDN docs on all the topics that I have linked are full of great info.