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4

For text you do can simply use the corresponding html tag and write <s>strikethrough text</s> to get: strikethrough text. I will explicitly mention that this works in posts but not in comments. See also: Does Markdown have a way to express strikeout? and How to strike text? I will also add that in chat you can use the syntax ---strikethrough ...


2

Line break within math mode. $$ x + y = 2\\x - y = 4 $$ Output: $$ x + y = 2\\x - y = 4 $$


2

Input: Output: Period. Period. Period and two spaces. Period. Period. Period. Period. Period.


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