fix: make callout detection case-insensitive (closes #171)

Jacky Zhao

2022-08-05 5c76d8dad9d993010c4e57c6de4e90911a3cd11a

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const addCollapsibleCallouts = () => {
    const collapsibleCallouts = document.querySelectorAll("blockquote.callout-collapsible");
    collapsibleCallouts.forEach(el => el.addEventListener('click', event => {
        event.currentTarget.classList.toggle("callout-collapsed");
    }));
}