@katainaka0503, thanks for your PR! By analyzing the history of the files in this pull request, we identified @jrieken and @Tyriar to be potential reviewers.

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This is 2 major version jumps which could mean this introduces breakages. Here's the change log https://github.com/markdown-it/markdown-it/blob/master/CHANGELOG.md

@katainaka0503 Thank you for the contribution.

Let's hold off on merging this in until next week. We're just about to ship 1.9 and I want this sort of change to have more testing in insiders builds before it goes out officially