Test pattern (reconfirmed with EazyDraw version 9, October 8, 2018): The top blocks of colors are generated by CSS / HTML hex color settings (#ff0000, #ffff00, ...). The lower blocks of colors derived from an EazyDraw png exported image using the same hex color specifications. The PNG was exported using Wide Gamut P3 color space. The top png color blocks match the Safari browser version 12.0.1 using sRGB colors. If you are viewing with a wide gamut P3 display you will see pairs of color blocks showing P3 on the left (brighter) and sRGB on the right, these are defined as independent colors by EazyDraw. This demonstrates EazyDraw's ability to author brighter wide gamut (high dynamic range) colors for displays and browsers with the capability.
Make the browser window wide to provide aligned overlap of the two sets of test colors. On your screen with any web browser there should be no discernible color-shade differences, thus verifying that you can count on EazyDraw to provide precise color managed colors for web graphics. You may confirm that the color blocks have two completely different modes of generation by making the browser window narrower, the CSS blocks will resize and reposition (depending on browser) but the EazyDraw png image blocks do not move or resize. This precise calibrated color matching works with PNG, TIFF, and JPG images.