it seems that NVDA on Windows Chrome and FF doesn't read the word "selection" correctly. The word actually gets spelled. Setting the lang attribute doesn't help. I've tested this behavior also on other sites, like This One and get the same result: the word is spelled not read out.
When i tab to the buttons it says. "remove s e l e c t i o n". Do you have any ideas?
<div lang="en">
<button>
remove selection
</button>
<button>
add to selection
</button>
</div>