const iframe = document.createElement("iframe");
iframe.style.position = "absolute";
iframe.style.left = "-99999px";
iframe.style.width = "794px";
iframe.style.height = "1123px";

document.body.appendChild(iframe);

iframe.srcdoc = html;

await new Promise(resolve => {
    iframe.onload = () => setTimeout(resolve, 500);
});

await html2pdf()
    .set({
        margin: 10,
        filename: file.name.replace(".html", ".pdf"),
        html2canvas: {
            scale: 2
        },
        jsPDF: {
            unit: "mm",
            format: "a4",
            orientation: "portrait"
        }
    })
    .from(iframe.contentDocument.body)
    .save();

iframe.remove();