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 Interacting with the DOM Traversing the DOM Traversing up the DOM with parentNode

Posted by Ivonne Benites
Ivonne Benites
6,044 Points

Why do we use the word BUTTON in capitalized letters? if(event.target.tagName === 'BUTTON')

taskList.addEventListener('mouseover', (event) => { if(event.target.tagName === 'BUTTON'){ } })

2 Answers

Steven Parker
Steven Parker
231,261 Points
Steven Parker
Steven Parker
231,261 Points

HTML tag names are always upper case internally as required by the W3C specifications, so the string must also be upper case to match.

Ivonne Benites
Ivonne Benites
6,044 Points
Ivonne Benites
Ivonne Benites
6,044 Points

Hello Steven, Thank you so much for the explanation, I appreciate it