Border around tr element doesn’t show?

Add this to the stylesheet:

table {
  border-collapse: collapse;
}

JSFiddle.

The reason why it behaves this way is actually described pretty well in the specification:

There are two distinct models for setting borders on table cells in
CSS. One is most suitable for so-called separated borders around
individual cells, the other is suitable for borders that are
continuous from one end of the table to the other.

… and later, for collapse setting:

In the collapsing border model, it is possible to specify borders that
surround all or part of a cell, row, row group, column, and column
group.

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