Go to this example
Put the cursor after the "s" in the first word, "This".
Then press the spacebar twice. A ". " will be inserted at the cursor.
So the text changes from
This is editable plain text, just like a <textarea>!
to
This . is editable plain text, just like a <textarea>!
Even though all you do is press spacebar twice.
I get this unexpected behavior in all text blocks.
Perhaps this was some debugging for AutoReplace that wasn't removed in production?
I think you may just be running into custom Mac behavior: https://www.tekrevue.com/tip/macos-sierra-add-period-double-space/ . I was able to reproduce it on a Macbook inside of the Notes app.
@davidchang Wow, you're right. I didn't know about this mac feature, which was enabled by default for me (even thought it's apparently not supposed to be enabled by default). Closing this issue.
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@davidchang Wow, you're right. I didn't know about this mac feature, which was enabled by default for me (even thought it's apparently not supposed to be enabled by default). Closing this issue.