Instacart, while still in implementation, came to their AE (J.Jones) with some access issues. Some of these templates don't work yet (internal server errors) but backing them up just in case
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<script type="text/javascript">
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const resizeIframe = () => {
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const combinedPadding = 16;
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const previewIframe = document.getElementById("previewIframe");
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const previewIFrameCard = document.getElementById("previewIFrameCard");
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const templateInPreviewContainer = previewIframe.contentWindow.document.querySelector('.np-certificate-container');
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const previewIframeContentHeight = templateInPreviewContainer.offsetHeight;
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const previewIframeContentWidth = templateInPreviewContainer.offsetWidth;
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const certificateRatio = previewIframeContentHeight / previewIframeContentWidth;
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templateInPreviewContainer.style.margin = 0;
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previewIFrameCard.style.height = `${previewIFrameCard.offsetWidth * certificateRatio}px`;
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const scaledIframeWidth = previewIFrameCard.offsetWidth - combinedPadding;
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const scaledIframeHeight = scaledIframeWidth * certificateRatio;
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const scale = scaledIframeHeight / previewIframeContentHeight;
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previewIframe.style.transform = `scale(${scale})`;
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}
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window.onresize = resizeIframe;
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</script>
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<div class="col-xs-12 col-md-8 np-certificate-iframe-container">
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<div class="np-card spacing-clear">
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<div id="previewIFrameCard" class="np-card-container np-certificate-card">
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<iframe
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id="previewIframe"
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onload="resizeIframe()"
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class="np-certificate-iframe-preview"
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srcdoc="{{ certificate.certificate_template_html }}"
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></iframe>
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</div>
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</div>
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</div>
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