discourse/app/assets/javascripts/wizard/templates/components/theme-preview.hbs

<div class='preview-area'>
  <canvas width={{elementWidth}} height={{elementHeight}} style={{concat "width:" width "; height:" height ";"}}>
  </canvas>
</div>
Wizard - Color Scheme Step 2016-09-02 23:42:14 +08:00			`<div class='preview-area'>`
UX: Render wizard previews for high-DPI displays (#7371) * UX: Render wizard previews for high-DPI displays Sets up a canvas element of twice the required dimensions, scales all coordinates by 2x, then shrinks the display in css. * Use window.devicePixelRatio to determine scale factor 2019-04-15 14:16:05 +08:00			`<canvas width={{elementWidth}} height={{elementHeight}} style={{concat "width:" width "; height:" height ";"}}>`
Wizard - Color Scheme Step 2016-09-02 23:42:14 +08:00			`</canvas>`
			`</div>`