Robb Knight
Maker of web things, blogger, podcaster, and pizzaiolo. Cat dad and human dad.
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Strikethrough on Github is one or two tildes, but the Github Flavored Markdown spec has it as two. I spent a while wondering why Eleventy didn't support strikethrough. John Gruber wrote about strikethrough here which was never in his original Markdown spec.
// on Github
~this will strikethrough~
~~this will also strikethrough~~
// basically anywhere other markdown library
~~this will strikethrough~~