Seems like it produces false positives on Xenforo forum software

[roymckenzie]

          Seems like it produces false positives on Xenforo forum software, see images [here](https://www.spigotmc.org/resources/placeholderapi.6245/)

Originally posted by @kangarko in #8 (comment)

[roymckenzie]

I believe @kangarko is referencing the ​ character entity in the alt of the img tag.

We should find a different way to handle zero-width spaces contained in non-text nodes.