How to Edit Image Size in HTML on Tumblr. If your blog images are too large, users may have to scroll to see them. Make the images too small, and blog visitors might not notice them.

Density, typically in ppi, is how resolution is mapped to scale on a display or when printing. In this image, the 72 dpi and 144 dpi have the same resolution, but are mapped at different scales.

11 HTML Attributes For SEO & Why They Matter HTML is the foundation of a webpage. Discover the key HTML tags and attributes that are crucial to good SEO. Find out their uses and how to code them.