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Read a nested optional value
Avoid dereferencing a missing nested object.
optional chaining✓ Tested
Span one header across several columns
HTML: Colspan lets a heading cover a defined number of columns in the table grid.
HTML✓ Tested
Visit associative-array keys in a stable order
Bash Scripts: Associative arrays have no defined iteration order, so sort their keys explicitly.
Bash Scripts✓ Tested