tootlab-mastodon/app/javascript/core/embed.js

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JavaScript
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// This file will be loaded on embed pages, regardless of theme.
window.addEventListener('message', e => {
const data = e.data || {};
if (!window.parent || data.type !== 'setHeight') {
return;
}
function setEmbedHeight () {
window.parent.postMessage({
type: 'setHeight',
id: data.id,
height: document.getElementsByTagName('html')[0].scrollHeight,
}, '*');
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};
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if (['interactive', 'complete'].includes(document.readyState)) {
setEmbedHeight();
} else {
document.addEventListener('DOMContentLoaded', setEmbedHeight);
}
});