`iframe.contentWindow.print()` does not work for a PDF in Chrome. Chrome backs
every PDF — src URL or blob URL — with its internal `pdf_embedder` extension
rather than a real DOM document, so the frame's `contentDocument` is an empty
shell:
<html><head><link rel="stylesheet"
href="chrome-extension://…/pdf_embedder.css"></head>
<body></body></html>
The PDF *paints* — you can see it in the preview — but `print()` runs against
that empty body, so the operator gets a print dialog full of blank pages and
no error to explain why. Read straight out of a live page to confirm.
A new tab gets Chrome's real PDF viewer, whose own print button works. Same
document, no blank pages.
Affects the delivery-note preview, the quote PDF viewer, and the second quote
viewer in the same file. Popup-blocked is now reported explicitly rather than
appearing to do nothing.
Dave
ad869aa6f8