Scroll down to see some examples.

Placeholder for the image "testimg_1d61597ba3.jpg".This is testimg_1d61597ba3.jpg
Placeholder for the image "testimg2_8abb655648.jpg".This is testimg2_8abb655648.jpg

This image has "proportionalHeight={100}", so its height is equal to its width.

Placeholder for the image "testimg_1d61597ba3.jpg".This is testimg_1d61597ba3.jpg

This image has just a plain url, so it does neither show a placeholder nor use webp oder srcset.

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