Transition parent opacity with bootstrap btn

In the following code, the transition opacity to 0 finish immediately instead of 0.5s.
It only works correctly if the `btn` class is remove from the button. (line 11)

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[Note]
- Test on firefox 121.0 and chromium 119.0.
- Insert `wait 0.5s` before the line of `remove closet .parent` (insert to line 14) it will work on firefox but not on chrome. (It is not correct way to use hyperscript anyway)