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Strange Line Height issue when using JSPDF and HTML2CANVAS

I have spent the past couple days looking at the documentation and issues online and cannot find a similar problem that is relevant to my issue.

What seems to be happening is JSPDF is calculating its own line height based on the font size for the first text node of any given table or div. In fact it seems to create identical font height spacing for any text node, including random test text that is not even inside an element.

The only fix I can find is to add a bunch of negative margins to shift the positioning of the first text elements, but that is not a great option.

I confirmed it is not happening inside HTML2CANVAS by using the onclone() callback to append a child element and compare the 2 layouts.

I have tried setting the lineHeightFactor, which has no effect, setting line-height inline to ensure it is being used. I even completely reset all margins, padding and line-height to 0 and JSPDF still adds the extra spacing to the first text element in any given div element, while everything else is stacked on each other. This does not happen with images, only text nodes.

This is what I am using to trigger the PDF:

        let pdf = new jsPDF({
            orientation: 'landscape',
            unit: 'mm',
            format: 'letter',
            precision: 1,
        })
        pdf.addFileToVFS('Roboto.ttf', this.Base64.roboto)
        pdf.addFont('Roboto.ttf', 'Roboto', 'normal')
        pdf.addFileToVFS('RobotoBold.ttf', this.Base64.robotoBold)
        pdf.addFont('RobotoBold.ttf', 'Roboto', 'bold')
        window['html2canvas'] = html2canvas;
        let html = document.querySelector('.sign-wrap')
        html.style.display = 'block'
        pdf.html(html, {
            html2canvas: {
                allowTaint: true,
                useCORS: true,
                scale: 0.2530,
                logging: false,
            },
            callback: async (pdf) => {
                pdf.save(`sign.pdf`)
                html.style.display = 'none'
            }
        })
        
    }
Via Active questions tagged javascript - Stack Overflow https://ift.tt/2FdjaAW
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