How do you force format specifiers in console.log format to be treated as literals?

[rshpount]

For instance if I need "console.log("%d %d", 1);" to output "%d 1", how do I force the first "%d" to be treated as a literal and not the format specifier?

Should "%%" which produces "%" as an output added to the Formatter?

[domenic]

Firefox and Chrome already do this in the way you describe. Good catch. I think we should update the spec to account for it.

[rshpount]

I have also verified that this is what Chrome 73, Firefox 66 , IE 11, Edge 17, and Safari 12 are doing already.

I have also noticed that Safari 12 does not handle "%" followed by invalid specifier gracefully. For instance in Safari 12, "console.log("%1 %d", 1);" prints "[object Object]d". It probably makes sense to add some language to specify how unsupported specifiers are supposed to be handled, especially if you want to allow future extensions.

[terinjokes]

%% is clearly an oversight. PRs definitely accepted.

I agree we should add some verbage for handling unknown formatters. I'll think about it this afternoon and post some ideas