Anchoir + Spoiler

The page has a spoiler with multiple tabs.
In the contents of one of the tabs of the spoiler, I inserted Anchor Link of the form:
<a name="my_anc"> </a>
But when trying to move on such anchor Link, the spoiler is not disclosed.
Then I tried to insert Anchor Link not in the contents of the tab, but directly to the tab itself (on its name).
It became better, at least scrolling works well, but the spoiler is still not disclosed.
How can autoreveal one of the Spoiler tabs where Anchor Link is present?