Edge Browser Support

Does Elgg support Edge browser? My website currently runs on Elgg 2.3.7. One of my customers found a bug (he uses Edge) when using textarea to reply to a blog post. This is how it happened:

1) The user clicked a blog title from the blog page that he wanted to reply to

2) When the user started typing in the textarea, he found that the textarea displayed only the first character of a word/sentence but  the rest was appended to 'Edit HTML'. For example, typing "This". The textarea will display only letter 'T' and 'his' will append to 'Edit HTMLhis'

What is the best way to fix this issue?