expandable element ignores the "open" option

[KevinRohn]

What's your feature/idea?

The expandable element ignores the open option.

Markdown:

<details open>
<summary>Expandable open on page view 😄 </summary>

Some content I want to show without collapse the expandable manually.

</details> 

<details>
<summary>Expandable open only when collapsed </summary>

Some content I want to show only when I collapse the expandable element.

</details> 

What's your desired outcome?

Preview:

Expandable open on page view 😄

Some content I want to show without collapse the expandable manually.

Expandable open only when collapsed

Some content I want to show only when I collapse the expandable element.

What's the impact of this for you?

• Critical
• High
• Medium
• Low

Anything else?

No response

[taszap]

Related to #220

[taszap]

Closing in favour of #220