Hidden attribute aren't making any difference!

Please consider below scenario:

text 1:
```
<h1> hello world </h1>
<a href='some-link'>link1</a>
```

text 2:
```
<h1> hello world </h1>
<a href='some-other-link'>link1</a>
```

In htmldiff it now showing any changes even though link's url has been changed.