Yes, thank you for your support.
And I already see that you've tried out this element. But either this is "too standard" tag, or you've chosen a very simple implementation of it as extensions.
The fact is that the word "SPOILER" is almost always associated with the behavior of a "collapsing node from a simplified tree view | nested view" and w/o any exceptions

)))
That is, when the user doesn't make any effort to explain HOW to display the spoiler's content, the forum's engine automatically adds indentation for visual highlighting and inserts a some special symbol before of all spoiler's content... A plus sign, an arrow, a flashing indicator. The engine displays a tooltip for the action of clicking on this symbol.
When you click on a symbol the engine automatically opens the hidden area. After clicking and expanding the area, the engine changes the symbol for the opposite action (collapsing), and it changes the tooltip text accordingly.
This all is demonstrated in the GIF image that accompanies the description of the extension, which I shared in my previous post.
And your chosen current version of the SPOILER tag support does something very strange - it
just shows a gray quadrilateral. Which, depending on what I wanted to put under this tag, can take up a huge amount of space on the page. And this tag support only allows you to make a single click to reveal the hidden content. This behavior is more typical of the HIDE tag. When you need to hide a small but important piece of information inside the text (An inline purposes for hiding info). For example a login and password for accessing a resource.
And it turns out that now it's not possible to intuitively apply the SPOILER tag - because its behavior will not be what is expected

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And yes, much later than you will spend time reading this text - I guessed that in your post you provided an example for supporting of added ANOTHER tag! It's like this - I couldn't understand for a very long time - why you wrote a text about opening a spoiler UNDER the spoiler itself. And it turned out that this is some new tag DETAILS. Which is much more similar to the expected SPOILER tag in terms of its behavior but not enough.
As you can see in your post the presence of the simple text "Click to show" does not mean that the user will actually click on these words immediately. These words are not separated from the text in any way, and there is no symbolism in this text-like-tooltip. Moreover, when I click and open the hidden text the body of the tooltip does not change in any way!!! The text still displays "Click to
show"!!!
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Therefore, if possible, I would like to make the following suggestion:
Support for the SPOILER tag should be taken from the forum engine extension library, at least the one I mentioned in the link above.
Where the behavior of the rendered text on the page will most intuitively match the user's desire to use this tag.
or from here:
https://www.phpbb.com/customise/db/exte ... er_bbcode/
The current behavior of the SPOILER tag should be transferred to the HIDE tag.
Although the DETAILS tag closely resembles the behavior of the SPOILER tag, it is not sufficient to keep it in its current form for support purposes.
It can be hidden for now, and it might be possible to modify it later for a more useful behavior?
And by the way, I haven't found any official documentation stating that DETAILS exists for the phpbb engine
And once again, I express my great gratitude for this hard and painstaking work that you do every day.
Your work is very valuable to us. Thank you very much.