Open details tag if summary is targeted by ID

[NReib]

In chrome if you have a closed details tag and your url anchor targets the ID of its summary element, the details tag will be opened (on page load / hashchange). It would be nice to see this behaviour in FF as well.

Using: test.html#test

<details>
<summary id="test">Test open by ID</summary>
<div>	
I will be open
</div></details>

<details>
<summary>Test closed</summary>
<div>	
I will be closed
</div></details>

[Jon]

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