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Walter Ebert

Discovered that the img sizes attribute uses the first value that matches and apparently doesn't evaluate all values

OK, I admit that i have been using CSS position without knowing about the containing block

Setting width/height in CSS, not just in the image, makes a big difference in Google Pagespeed

Apparently Google's Speed Scorecard only works on pre-selected domains. Doesn't work on your own (small) site 🤔