WebView Markdown doesn't expand <details>

[Monty]

On an iPhone, with Markdown Render Engine set to WebView, <details> are not expanded.

Excerpt below taken from this repo.

A sliver of the expansion shows up but I can't scroll down to see it.

Using the flutter engine, the <details> are always expanded.

**Screenshots**

<h3 align="center">game board</h3>

![game board](https://user-images.githubusercontent.com/95859352/152353492-a706e77f-9a7e-4d09-8a43-   8a5c1470e7f3.png)

<details><summary><b>Show other screenshots</b></summary>

<h3 align="center">menu</h3>

![menu](https://user-images.githubusercontent.com/95859352/152353450-3c0fba45-0341-4902-9e27-         23a1c757b2aa.png)

<h3 align="center">difficult mode</h3>

![difficult mode](https://user-images.githubusercontent.com/95859352/152353527-08d8ccdc-3fc9-4fac-    a391-d0a960e2b0e3.png)

</details>