Why?
When the width and height attributes are not specified on an image, browsers need to reflow the page when the image has finished loading, which may disrupt the user experience.
How?
Add width and height attributes matching the actual dimensions of the image.
Where?
More information
Severity: low
Useful improvements are possible.
Category: Check graphics and colors
Images, colors, and style brighten content, but require care: devices may have low-contrast screens or may not support some formats.
Best practice:
Specify the size of images in markup, if they have an intrinsic size.