Why Does My Body Element's Background Style Cover the Entire Screen?

Why Does Background Styling for the Body Element Extend Beyond Its Bounds?

When styling the background of the body element, you may notice that the styling extends to the entire screen, not just the body itself. To understand this behavior, we delve into the intricacies of CSS rules and the browser's rendering process.

According to the CSS 2.1 specification, "the background of the root element becomes the background of the canvas and covers the entire canvas". This means that when you apply background styling to the body element, which is the root element of a web page, the styling is not solely applied to the body but rather to the entire canvas, the area within the browser window.

Consequently, the background style is no longer applied to the body, and the body loses its own background. Instead, the background style is applied directly to the canvas, resulting in the entire screen being affected. This ensures consistency in the rendering of the page, preventing the body's background color from overriding the background of the canvas, which could lead to visual inconsistencies.

However, other styling properties such as borders remain isolated to the body element. So, in the example provided, the border will still be 700px wide as specified for the body element, while the background color extends to the entire screen, as it is applied to the canvas.

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