cupper-hugo-theme/themes/infusion/layouts/shortcodes/demo.html

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{{ $uniq := .Inner | htmlEscape | md5 | lower }}
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<div class="demo-container">
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{{ if .Get "caption" }}
<figure role="group" aria-labelledby="caption-{{ $uniq }}">
{{ end }}
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<div class="demo-inner">
<div class="demo" id="js-demo-{{ $uniq }}"></div>
<button data-launch="js-demo-{{ $uniq }}">Launch in separate window</button>
</div>
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{{ if .Get "caption" }}
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<figcaption id="caption-{{ $uniq }}">{{ .Get "caption" | markdownify }}</figcaption>
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{{ end }}
{{ if .Get "caption" }}
</figure>
{{ end }}
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<template id="template-{{ $uniq }}">
{{ .Inner }}
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</template>
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<script>
(function() {
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var root = document.getElementById('js-demo-{{ $uniq }}');
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var template = document.getElementById('template-{{ $uniq }}');
var script = template.content.querySelector('script');
if (script) {
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var standaloneScript = '(function() { document.getElementsByTagName(\'html\')[0].setAttribute(\'lang\', \'en\'); var demo = document; ' + script.textContent + ' })()';
var wrappedScript = '(function() { var demo = document.getElementById(\'js-demo-{{ $uniq }}\').shadowRoot;' + script.textContent + '})()';
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script.textContent = wrappedScript;
}
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if (document.head.attachShadow) {
root.attachShadow({mode: 'open'});
root.shadowRoot.appendChild(document.importNode(template.content, true));
} else {
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root.innerHTML = '<p class="site-error"><strong style="font-weight:bold">Site error:</strong> A browser supporting Shadow DOM is needed to run encapsulated demos. You can launch the demo in a separate window ↓</p>';
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}
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var launchButton = document.querySelector('[data-launch="js-demo-{{ $uniq }}"]');
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launchButton.addEventListener('click', function () {
var demoContent = template.content;
var standalone = window.open();
script.textContent = standaloneScript;
standalone.document.body.appendChild(document.importNode(template.content, true));
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standalone.document.title = 'demo ' + {{ $uniq }}
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});
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})();
</script>
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</div>