Export with a fill (background color) of 'none' results in black background #492
Description
Expected behaviour
Last year (as late as October 2023) Highcharts public Export server used to produce exported JPG with white when a value of 'none' was passed in the svg.
Actual behaviour
Sometime since then, it started generating charts with black backgrounds unless a color is specified.
Reproduction steps
The request below used to produce jpegs with white background but now they have a black background:
curl 'https://export.highcharts.com/' \
-H 'authority: export.highcharts.com' \
-H 'accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7' \
-H 'content-type: multipart/form-data; boundary=----WebKitFormBoundary89LFVt52WjGB2ey4' \
--output 'sample-title-002.jpeg' \
--data-raw $'------WebKitFormBoundary89LFVt52WjGB2ey4\r\nContent-Disposition: form-data; name="filename"\r\n\r\nsample-title-002\r\n------WebKitFormBoundary89LFVt52WjGB2ey4\r\nContent-Disposition: form-data; name="type"\r\n\r\nimage/jpeg\r\n------WebKitFormBoundary89LFVt52WjGB2ey4\r\nContent-Disposition: form-data; name="width"\r\n\r\nundefined\r\n------WebKitFormBoundary89LFVt52WjGB2ey4\r\nContent-Disposition: form-data; name="scale"\r\n\r\n2\r\n------WebKitFormBoundary89LFVt52WjGB2ey4\r\nContent-Disposition: form-data; name="svg"\r\n\r\n<svg xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" class="highcharts-root" style="font-family: Helvetica, Arial, sans-serif; font-size: 1rem;" xmlns="http://www.w3.org/2000/svg" width="600" height="400" viewBox="0 0 600 400" aria-label="Interactive chart" aria-hidden="false"><desc aria-hidden="true">Created with Highcharts 11.1.0</desc><defs aria-hidden="true"><filter id="highcharts-drop-shadow-9"><feDropShadow dx="1" dy="1" flood-color="#000000" flood-opacity="0.75" stdDeviation="2.5"></feDropShadow></filter><clipPath id="highcharts-jdnbatt-206-"><rect x="0" y="0" width="526" height="209" fill="none"></rect></clipPath><clipPath id="highcharts-jdnbatt-217-"><rect x="0" y="0" width="526" height="209" fill="none"></rect></clipPath></defs><rect fill="none" class="highcharts-background" filter="none" x="0" y="0" width="600" height="400" rx="0" ry="0" aria-hidden="true"></rect><rect fill="none" class="highcharts-plot-background" x="64" y="47" width="526" height="209" filter="none" aria-hidden="true"></rect><g class="highcharts-pane-group" data-z-index="0" aria-hidden="true"></g><g class="highcharts-grid highcharts-xaxis-grid" data-z-index="1" aria-hidden="true"><path fill="none" stroke="#ccc" stroke-width="0" stroke-dasharray="none" data-z-index="1" class="highcharts-grid-line" d="M 116.5 47 L 116.5 256" opacity="1"></path><path fill="none" stroke="#ccc" stroke-width="0" stroke-dasharray="none" data-z-index="1" class="highcharts-grid-line" d="M 168.5 47 L 168.5 256" opacity="1"></path><path fill="none" stroke="#ccc" stroke-width="0" stroke-dasharray="none" data-z-index="1" class="highcharts-grid-line" d="M 221.5 47 L 221.5 256" opacity="1"></path><path fill="none" stroke="#ccc" stroke-width="0" stroke-dasharray="none" data-z-index="1" class="highcharts-grid-line" d="M 273.5 47 L 273.5 256" opacity="1"></path><path fill="none" stroke="#ccc" stroke-width="0" stroke-dasharray="none" data-z-index="1" class="highcharts-grid-line" d="M 326.5 47 L 326.5 256" opacity="1"></path><path fill="none" stroke="#ccc" stroke-width="0" stroke-dasharray="none" data-z-index="1" class="highcharts-grid-line" d="M 379.5 47 L 379.5 256" opacity="1"></path><path fill="none" stroke="#ccc" stroke-width="0" stroke-dasharray="none" data-z-index="1" class="highcharts-grid-line" d="M 431.5 47 L 431.5 256" opacity="1"></path><path fill="none" stroke="#ccc" stroke-width="0" stroke-dasharray="none" data-z-index="1" class="highcharts-grid-line" d="M 484.5 47 L 484.5 256" opacity="1"></path><path fill="none" stroke="#ccc" stroke-width="0" stroke-dasharray="none" data-z-index="1" class="highcharts-grid-line" d="M 536.5 47 L 536.5 256" opacity="1"></path><path fill="none" stroke="#ccc" stroke-width="0" stroke-dasharray="none" data-z-index="1" class="highcharts-grid-line" d="M 589.5 47 L 589.5 256" opacity="1"></path><path fill="none" stroke="#ccc" stroke-width="0" stroke-dasharray="none" data-z-index="1" class="highcharts-grid-line" d="M 63.5 47 L 63.5 256" opacity="1"></path></g><g class="highcharts-grid highcharts-yaxis-grid" data-z-index="1" aria-hidden="true"><path fill="none" stroke="#ccc" stroke-width="1" stroke-dasharray="none" data-z-index="1" class="highcharts-grid-line" d="M 64 256.5 L 590 256.5" opacity="1"></path><path fill="none" stroke="#ccc" stroke-width="1" stroke-dasharray="none" data-z-index="1" class="highcharts-grid-line" d="M 64 186.5 L 590 186.5" opacity="1"></path><path fill="none" stroke="#ccc" stroke-width="1" stroke-dasharray="none" data-z-index="1" class="highcharts-grid-line" d="M 64 117.5 L 590 117.5" opacity="1"></path><path fill="none" stroke="#ccc" stroke-width="1" stroke-dasharray="none" data-z-index="1" class="highcharts-grid-line" d="M 64 46.5 L 590 46.5" opacity="1"></path></g><rect fill="none" class="highcharts-plot-border" data-z-index="1" stroke="#cccccc" stroke-width="0" x="64" y="47" width="526" height="209" aria-hidden="true"></rect><g class="highcharts-axis highcharts-xaxis" data-z-index="2" aria-hidden="true"><text x="327" data-z-index="7" text-anchor="middle" transform="translate(0,0)" class="highcharts-axis-title" style="color: rgb(0, 0, 0); font-size: 0.8em; fill: rgb(0, 0, 0);" y="302.6666669845581">Sample X-Axis</text><path fill="none" class="highcharts-axis-line" stroke="#ccc" stroke-width="1" data-z-index="7" d="M 64 256.5 L 590 256.5"></path></g><g class="highcharts-axis highcharts-yaxis" data-z-index="2" aria-hidden="true"><text x="24.76041603088379" data-z-index="7" text-anchor="middle" transform="translate(0,0) rotate(270 24.76041603088379 151.5)" class="highcharts-axis-title" style="color: rgb(0, 0, 0); font-size: 0.8em; fill: rgb(0, 0, 0);" y="151.5">Sample Y-Axis</text><path fill="none" class="highcharts-axis-line" stroke="#ccc" stroke-width="0" data-z-index="7" d="M 64 47 L 64 256"></path></g><g class="highcharts-series-group" data-z-index="3" filter="none" aria-hidden="false"><g class="highcharts-series highcharts-series-0 highcharts-column-series" data-z-index="0.1" opacity="1" transform="translate(64,47) scale(1 1)" clip-path="url(#highcharts-jdnbatt-217-)" aria-hidden="false" role="region" tabindex="-1" aria-label="Pistachio, bar series 1 of 3 with 10 bars." style="outline: none;"><path fill="#4886c3" d="M 14.5 158.5 L 17.5 158.5 A 3 3 0 0 1 20.5 161.5 L 20.5 209.5 A 0 0 0 0 1 20.5 209.5 L 11.5 209.5 A 0 0 0 0 1 11.5 209.5 L 11.5 161.5 A 3 3 0 0 1 14.5 158.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2010, 3.64. Pistachio." style="outline: none;"></path><path fill="#4886c3" d="M 66.5 159.5 L 69.5 159.5 A 3 3 0 0 1 72.5 162.5 L 72.5 209.5 A 0 0 0 0 1 72.5 209.5 L 63.5 209.5 A 0 0 0 0 1 63.5 209.5 L 63.5 162.5 A 3 3 0 0 1 66.5 159.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2011, 3.6. Pistachio." style="outline: none;"></path><path fill="#4886c3" d="M 119.5 156.5 L 122.5 156.5 A 3 3 0 0 1 125.5 159.5 L 125.5 209.5 A 0 0 0 0 1 125.5 209.5 L 116.5 209.5 A 0 0 0 0 1 116.5 209.5 L 116.5 159.5 A 3 3 0 0 1 119.5 156.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2012, 3.79. Pistachio." style="outline: none;"></path><path fill="#4886c3" d="M 171.5 158.5 L 174.5 158.5 A 3 3 0 0 1 177.5 161.5 L 177.5 209.5 A 0 0 0 0 1 177.5 209.5 L 168.5 209.5 A 0 0 0 0 1 168.5 209.5 L 168.5 161.5 A 3 3 0 0 1 171.5 158.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2013, 3.63. Pistachio." style="outline: none;"></path><path fill="#4886c3" d="M 224.5 160.5 L 227.5 160.5 A 3 3 0 0 1 230.5 163.5 L 230.5 209.5 A 0 0 0 0 1 230.5 209.5 L 221.5 209.5 A 0 0 0 0 1 221.5 209.5 L 221.5 163.5 A 3 3 0 0 1 224.5 160.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2014, 3.53. Pistachio." style="outline: none;"></path><path fill="#4886c3" d="M 277.5 151.5 L 280.5 151.5 A 3 3 0 0 1 283.5 154.5 L 283.5 209.5 A 0 0 0 0 1 283.5 209.5 L 274.5 209.5 A 0 0 0 0 1 274.5 209.5 L 274.5 154.5 A 3 3 0 0 1 277.5 151.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2015, 4.17. Pistachio." style="outline: none;"></path><path fill="#4886c3" d="M 329.5 144.5 L 332.5 144.5 A 3 3 0 0 1 335.5 147.5 L 335.5 209.5 A 0 0 0 0 1 335.5 209.5 L 326.5 209.5 A 0 0 0 0 1 326.5 209.5 L 326.5 147.5 A 3 3 0 0 1 329.5 144.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2016, 4.64. Pistachio." style="outline: none;"></path><path fill="#4886c3" d="M 382.5 144.5 L 385.5 144.5 A 3 3 0 0 1 388.5 147.5 L 388.5 209.5 A 0 0 0 0 1 388.5 209.5 L 379.5 209.5 A 0 0 0 0 1 379.5 209.5 L 379.5 147.5 A 3 3 0 0 1 382.5 144.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2017, 4.65. Pistachio." style="outline: none;"></path><path fill="#4886c3" d="M 434.5 148.5 L 437.5 148.5 A 3 3 0 0 1 440.5 151.5 L 440.5 209.5 A 0 0 0 0 1 440.5 209.5 L 431.5 209.5 A 0 0 0 0 1 431.5 209.5 L 431.5 151.5 A 3 3 0 0 1 434.5 148.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2018, 4.4. Pistachio." style="outline: none;"></path><path fill="#4886c3" d="M 487.5 145.5 L 490.5 145.5 A 3 3 0 0 1 493.5 148.5 L 493.5 209.5 A 0 0 0 0 1 493.5 209.5 L 484.5 209.5 A 0 0 0 0 1 484.5 209.5 L 484.5 148.5 A 3 3 0 0 1 487.5 145.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2019, 4.59. Pistachio." style="outline: none;"></path></g><g class="highcharts-markers highcharts-series-0 highcharts-column-series" data-z-index="0.1" opacity="1" transform="translate(64,47) scale(1 1)" clip-path="none" aria-hidden="true"></g><g class="highcharts-series highcharts-series-1 highcharts-column-series" data-z-index="0.1" opacity="1" transform="translate(64,47) scale(1 1)" clip-path="url(#highcharts-jdnbatt-217-)" aria-hidden="false" role="region" tabindex="-1" aria-label="Chocochip, bar series 2 of 3 with 10 bars." style="outline: none;"><path fill="#c77349" d="M 24.5 124.5 L 27.5 124.5 A 3 3 0 0 1 30.5 127.5 L 30.5 209.5 A 0 0 0 0 1 30.5 209.5 L 21.5 209.5 A 0 0 0 0 1 21.5 209.5 L 21.5 127.5 A 3 3 0 0 1 24.5 124.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2010, 6.08. Chocochip." style="outline: none;"></path><path fill="#c77349" d="M 77.5 123.5 L 80.5 123.5 A 3 3 0 0 1 83.5 126.5 L 83.5 209.5 A 0 0 0 0 1 83.5 209.5 L 74.5 209.5 A 0 0 0 0 1 74.5 209.5 L 74.5 126.5 A 3 3 0 0 1 77.5 123.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2011, 6.2. Chocochip." style="outline: none;"></path><path fill="#c77349" d="M 129.5 121.5 L 132.5 121.5 A 3 3 0 0 1 135.5 124.5 L 135.5 209.5 A 0 0 0 0 1 135.5 209.5 L 126.5 209.5 A 0 0 0 0 1 126.5 209.5 L 126.5 124.5 A 3 3 0 0 1 129.5 121.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2012, 6.31. Chocochip." style="outline: none;"></path><path fill="#c77349" d="M 182.5 120.5 L 185.5 120.5 A 3 3 0 0 1 188.5 123.5 L 188.5 209.5 A 0 0 0 0 1 188.5 209.5 L 179.5 209.5 A 0 0 0 0 1 179.5 209.5 L 179.5 123.5 A 3 3 0 0 1 182.5 120.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2013, 6.41. Chocochip." style="outline: none;"></path><path fill="#c77349" d="M 234.5 120.5 L 237.5 120.5 A 3 3 0 0 1 240.5 123.5 L 240.5 209.5 A 0 0 0 0 1 240.5 209.5 L 231.5 209.5 A 0 0 0 0 1 231.5 209.5 L 231.5 123.5 A 3 3 0 0 1 234.5 120.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2014, 6.37. Chocochip." style="outline: none;"></path><path fill="#c77349" d="M 287.5 118.5 L 290.5 118.5 A 3 3 0 0 1 293.5 121.5 L 293.5 209.5 A 0 0 0 0 1 293.5 209.5 L 284.5 209.5 A 0 0 0 0 1 284.5 209.5 L 284.5 121.5 A 3 3 0 0 1 287.5 118.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2015, 6.51. Chocochip." style="outline: none;"></path><path fill="#c77349" d="M 340.5 115.5 L 343.5 115.5 A 3 3 0 0 1 346.5 118.5 L 346.5 209.5 A 0 0 0 0 1 346.5 209.5 L 337.5 209.5 A 0 0 0 0 1 337.5 209.5 L 337.5 118.5 A 3 3 0 0 1 340.5 115.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2016, 6.75. Chocochip." style="outline: none;"></path><path fill="#c77349" d="M 392.5 112.5 L 395.5 112.5 A 3 3 0 0 1 398.5 115.5 L 398.5 209.5 A 0 0 0 0 1 398.5 209.5 L 389.5 209.5 A 0 0 0 0 1 389.5 209.5 L 389.5 115.5 A 3 3 0 0 1 392.5 112.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2017, 6.93. Chocochip." style="outline: none;"></path><path fill="#c77349" d="M 445.5 111.5 L 448.5 111.5 A 3 3 0 0 1 451.5 114.5 L 451.5 209.5 A 0 0 0 0 1 451.5 209.5 L 442.5 209.5 A 0 0 0 0 1 442.5 209.5 L 442.5 114.5 A 3 3 0 0 1 445.5 111.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2018, 7.04. Chocochip." style="outline: none;"></path><path fill="#c77349" d="M 497.5 114.5 L 500.5 114.5 A 3 3 0 0 1 503.5 117.5 L 503.5 209.5 A 0 0 0 0 1 503.5 209.5 L 494.5 209.5 A 0 0 0 0 1 494.5 209.5 L 494.5 117.5 A 3 3 0 0 1 497.5 114.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2019, 6.84. Chocochip." style="outline: none;"></path></g><g class="highcharts-markers highcharts-series-1 highcharts-column-series" data-z-index="0.1" opacity="1" transform="translate(64,47) scale(1 1)" clip-path="none" aria-hidden="true"></g><g class="highcharts-series highcharts-series-2 highcharts-column-series" data-z-index="0.1" opacity="1" transform="translate(64,47) scale(1 1)" clip-path="url(#highcharts-jdnbatt-217-)" aria-hidden="false" role="region" tabindex="-1" aria-label="Mint, bar series 3 of 3 with 10 bars." style="outline: none;"><path fill="#87a860" d="M 35.5 68.5 L 38.5 68.5 A 3 3 0 0 1 41.5 71.5 L 41.5 209.5 A 0 0 0 0 1 41.5 209.5 L 32.5 209.5 A 0 0 0 0 1 32.5 209.5 L 32.5 71.5 A 3 3 0 0 1 35.5 68.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2010, 10.1. Mint." style="outline: none;"></path><path fill="#87a860" d="M 87.5 67.5 L 90.5 67.5 A 3 3 0 0 1 93.5 70.5 L 93.5 209.5 A 0 0 0 0 1 93.5 209.5 L 84.5 209.5 A 0 0 0 0 1 84.5 209.5 L 84.5 70.5 A 3 3 0 0 1 87.5 67.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2011, 10.22. Mint." style="outline: none;"></path><path fill="#87a860" d="M 140.5 63.5 L 143.5 63.5 A 3 3 0 0 1 146.5 66.5 L 146.5 209.5 A 0 0 0 0 1 146.5 209.5 L 137.5 209.5 A 0 0 0 0 1 137.5 209.5 L 137.5 66.5 A 3 3 0 0 1 140.5 63.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2012, 10.51. Mint." style="outline: none;"></path><path fill="#87a860" d="M 192.5 64.5 L 195.5 64.5 A 3 3 0 0 1 198.5 67.5 L 198.5 209.5 A 0 0 0 0 1 198.5 209.5 L 189.5 209.5 A 0 0 0 0 1 189.5 209.5 L 189.5 67.5 A 3 3 0 0 1 192.5 64.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2013, 10.43. Mint." style="outline: none;"></path><path fill="#87a860" d="M 245.5 65.5 L 248.5 65.5 A 3 3 0 0 1 251.5 68.5 L 251.5 209.5 A 0 0 0 0 1 251.5 209.5 L 242.5 209.5 A 0 0 0 0 1 242.5 209.5 L 242.5 68.5 A 3 3 0 0 1 245.5 65.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2014, 10.31. Mint." style="outline: none;"></path><path fill="#87a860" d="M 298.5 55.5 L 301.5 55.5 A 3 3 0 0 1 304.5 58.5 L 304.5 209.5 A 0 0 0 0 1 304.5 209.5 L 295.5 209.5 A 0 0 0 0 1 295.5 209.5 L 295.5 58.5 A 3 3 0 0 1 298.5 55.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2015, 11.06. Mint." style="outline: none;"></path><path fill="#87a860" d="M 350.5 45.5 L 353.5 45.5 A 3 3 0 0 1 356.5 48.5 L 356.5 209.5 A 0 0 0 0 1 356.5 209.5 L 347.5 209.5 A 0 0 0 0 1 347.5 209.5 L 347.5 48.5 A 3 3 0 0 1 350.5 45.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2016, 11.78. Mint." style="outline: none;"></path><path fill="#87a860" d="M 403.5 42.5 L 406.5 42.5 A 3 3 0 0 1 409.5 45.5 L 409.5 209.5 A 0 0 0 0 1 409.5 209.5 L 400.5 209.5 A 0 0 0 0 1 400.5 209.5 L 400.5 45.5 A 3 3 0 0 1 403.5 42.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2017, 11.99. Mint." style="outline: none;"></path><path fill="#87a860" d="M 455.5 43.5 L 458.5 43.5 A 3 3 0 0 1 461.5 46.5 L 461.5 209.5 A 0 0 0 0 1 461.5 209.5 L 452.5 209.5 A 0 0 0 0 1 452.5 209.5 L 452.5 46.5 A 3 3 0 0 1 455.5 43.5 Z" stroke="#ffffff" stroke-width="1" opacity="1" filter="none" class="highcharts-point" tabindex="-1" role="img" aria-label="2018, 11.9. 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Can anyone confirm if they're also seeing this? Has anything changed recently that could've affected the output. What would be a more appropriate default to ensure JPGs generate a white background chart and PNGs a transparent one?
Correction: I originally thought this also affected PNGs but in their case they export the images with a transparent background when "none" is provided.