HTML2PDF Module not rendering valid html or css correctly

[Ryan]

The module is using Chromium headless, so generally speaking, you can preview your HTML in Chrome print dialog, and Apryse HTML2PDF module output.

As for the header/footer HTML/CSS support see here, though as mentioned it is not 100% documented by Chromium.

Images do not appear in header and footer of HTML2PDF output

Question: I am unable to add an image, either remote (https) nor local (file) from the footer or header template. How can I add an image? Answer: If you search for headerTemplate on this site you can see the options for headers and footers. As for images, while its not clear from above, Chromium has extra restrictions on the header/footer templates. In particular remote resources cannot be loaded. Instead, you can Base64 encode your image file as described above.