Chromium/Linux here, I can replicate it on the specimen page.

https://fonts.google.com/specimen/Noto+Sans

Under the 'Styles' section, type:

    `foo`

You'll see the first ` overlap the f.

Now erase it all and type:

    ````

They all overlap each other and show up as just one `.

Edit: from what it looks like, the problem is specific to the sans. I can't replicate it with the serif (https://fonts.google.com/specimen/Noto+Serif if anyone wants to try).

Ouch! Thanks for the report. We'll look into fixing that ASAP.

Thanks for taking the time to explain the issue. Yes, same problem shows up here.

For me at least (Chrome), it seems like it isn't applying any surrounding spacing for the backtick. If you hit ` a few times and then hit some other character, they seem to occupy the same space in the text box.

I experience same problem with Firefox 47.0 on Ubuntu 15.10.