Spinners shouldn't erase your button's label.

With <wa-button loading>, screen readers still hear "Save" even when the spinner is showing.

A screenshot of 7 lines of HTML code on the Atom One theme in dark scheme. Spinners shouldn't erase your button's name. wa-button loading> Save /wa-button> While it's loading, screen readers still hear "Save," and aria-busy tells them it's working.