[Slackwise]

If you read the article and the spec, you'll see that any explicitly created variables will always take precedence over automatic IDs, so any globals will always override these IDs.

[angelmm]

In the additional considerations section [1], they mention about not consistent behaviors between browsers. Those are the kind of issues that are quite difficult to debug.

[1] https://css-tricks.com/named-element-ids-can-be-referenced-a...

[croes]

And that could be the problem if you try to access an element by id but a variable has the same name. This renders this option pretty useless.