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![Ivonne Benites](https://uploads.teamtreehouse.com/production/profile-photos/11513561/micro_17198628_10155568008480400_1031452167_n.jpg)
Ivonne Benites
6,044 PointsWhy 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](https://uploads.teamtreehouse.com/production/profile-photos/969492/micro_tool_chess_set_2.jpg)
Steven Parker
230,688 PointsHTML 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](https://uploads.teamtreehouse.com/production/profile-photos/11513561/micro_17198628_10155568008480400_1031452167_n.jpg)
Ivonne Benites
6,044 PointsHello Steven, Thank you so much for the explanation, I appreciate it