Page Weight

Page weight refers to the byte size of a web page. As it’s no longer 1994, a web page is rarely only the HTML of the URL viewed in a browser’s address bar. Rather, a web page as viewed and rendered in a browser uses specific elements and assets.

This is why page weight is inclusive of all assets used to create the page. These include:

• The HTML that makes up the page itself
  • Images and other media (video, audio, etc) embedded into the page
• Cascading Style Sheets (CSS) used for styling the page
• JavaScript to provide interactivity
• Third-Party resource containing one or more of the above.

— The Web Almanac by HTTP Archive