In brief
table-layout selects the table sizing algorithm. With fixed and an explicit width, column distribution is not determined by all the content as in automatic layout.
Useful to know
table-layout selects the table sizing algorithm. With fixed and an explicit width, column distribution is not determined by all the content as in automatic layout. [1]
This permits a more predictable arrangement, but long values may not fit. Check wrapping and overflow separately; equal columns do not guarantee that every value remains readable.
Sources
For further detail and to check the information: