WordPress / gutenberg-starter-theme

This CSS causes browser upscaling.

Lines 151 to 153 in 0661152

    
           .wp-block-image.alignleft, 
        
           .wp-block-image.alignright { 
        
             width: 100%

along with this CSS

gutenberg-starter-theme/css/blocks.css

Lines 160 to 166 in 0661152

    
           .wp-block-image .alignleft img, 
        
           .wp-block-image .alignright img, 
        
           .wp-block-image .alignleft figcaption, 
        
           .wp-block-image .alignright figcaption { 
        
             max-width: 100%; 
        
             width: 100%; 
        
           }

It is counter to aligning left or right to make the image 100% width.

	.wp-block-image.alignleft,
	.wp-block-image.alignright {
	width: 100%

	.wp-block-image .alignleft img,
	.wp-block-image .alignright img,
	.wp-block-image .alignleft figcaption,
	.wp-block-image .alignright figcaption {
	max-width: 100%;
	width: 100%;
	}