In brief
caption-side places a table caption on a chosen side. Common values top and bottom move the caption without turning it into an unrelated paragraph.
Useful to know
caption-side places a table caption on a chosen side. Common values top and bottom move the caption without turning it into an unrelated paragraph. [1]
Use it when presentation calls for the explanation beneath the data. HTML preserves the semantic connection, while CSS controls visual position. Also check the table's writing mode.
Sources
For further detail and to check the information: