In brief
text-decoration-line selects decorations such as underline, overline and line-through. Several types can be combined, while style and thickness are controlled separately.
Useful to know
text-decoration-line selects decorations such as underline, overline and line-through. Several types can be combined, while style and thickness are controlled separately. [1]
Do not use strikethrough as the only explanation that a value is invalid or replaced. Provide textual context, since a visual decoration alone does not explain the reason for change.
Sources
For further detail and to check the information: