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b1ca242d89
Currently, if there's an internal navigation event, we continue to process the
page normally. This has negative performance implication, and can result in
user-scripts producing unexpected results.
For example, imagine a page with a script that does.
```js
if (x) {
form.submit();
}
reloadProduct();
```
The call to `form.submit()` should stop the script from executing. And, if the
page has 10 other <script> tags after this, they shouldn't be loaded nor
executed.
This code terminates the execution of the current script on an internal
navigation event, and stops the rest of the page from load.
While I believe this creates a more "correct" behavior, it also introduces new
edge cases. There's no a period of time, between the termination being stopped
and then being resumed, where executing code is not safe.