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The preferences, set screen colours for the tags.
Use the palette to hide / show the tags in layout view. Use the coloured tile to set the tag on the selected text.
Alt Text Navigator. Quickly move around a document inspecting the alt text. Use the Edit button to open the InDesign Object Export Options.
The contrast palette shows the contrast for the current selection, includes the stroke.
The image is showing Hello with a black fill and magenta stroke. The selection is after the o character.