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I'm trying to find documentation for the v6 Magick++ API but none of the links on the website works:

Develop takes me to Magick++ which has a Documentation stating:

Detailed documentation is provided for all Magick++ classes, class methods, and template functions which comprise the API.

The website at https://legacy.imagemagick.org/api/magick++-classes.php is however empty except for the standard imagemagick.org header (at least in Firefox ESR and 94). At the moment I have no other browser to try it on.

There is also a link at the top of the page:

Magick++ API is the object-oriented C++ API to the ImageMagick image-processing library.

But this takes me to the v7 API https://imagemagick.org/api/Magick++/index.html. From this link I did manage to find the v6 API by just prepending "legacy." to the domain name, so maybe that's a very simple fix.

Version: ImageMagick 6.9.10-23 Q16 x86_64 20190101 https://imagemagick.org, Ubuntu 20.04, x86_64

Example under https://legacy.imagemagick.org/Usage/masking/#bg_remove does not work.
Downloading the example images, I expect the second command

convert overlay_difference.png -channel RGBA -separate +channel \
          -evaluate-sequence add  -threshold 0   overlay_mask.png

to output the image shown at https://legacy.imagemagick.org/Usage/masking/overlay_mask.png . Instead, I get a pure-white image.
Editing the command to

convert overlay_difference.png -channel RGB -separate +channel \
          -evaluate-sequence add  -threshold 0   overlay_mask.png

generates the expected mask.

I cannot figure out where the source for the legacy Usage section of the website is hosted, but the corresponding page for the new site is found here: https://github.com/ImageMagick/Usage/blob/c6dc6493a7de33503a569f9236c2be2be3c64d38/masking/index.html#L2566

The options linked at https://legacy.imagemagick.org/Usage/text/ bring a "500 Internal Server Error" page.

Example:

• https://legacy.imagemagick.org/Usage/option_link.cgi?strokewidth
• https://legacy.imagemagick.org/Usage/option_link.cgi?interword-spacing