Image Inconsistencies: How and When Browsers Download Images
CSS Wizardry
JUNE 11, 2018
My only reservation was knowing that, because the images are defined in CSS rather than HTML, their outgoing requests won’t start until the browser has created the Render Tree: it’s not until all the CSS has been downloaded, parsed, and the CSSOM constructed that the browser actually knows This div with this class is currently visible on the page and its background is set to be this image: I’d better download it! we can’t download a background-image until we’ve built the CSSOM).
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