How Can I Prevent Background Image Clipping with `background-size: cover` and `background-attachment: fixed` in CSS?

Clipping Background Images with CSS: Understanding Background-size Cover and Background-attachment Fixed

When using background images in a list of figures, setting both background-size: cover and background-attachment: fixed can lead to clipping issues when there is an offset. While this behavior is inherent to fixed positioning in CSS, we'll explore a CSS-only solution to mitigate this issue.

CSS Mechanics:

The combination of background-attachment: fixed and background-size: cover causes the background image to behave as a viewport-relative "fixed" image, and the cover value is calculated relative to the viewport size, not the element. This explains why the image is properly covered when the element fills the viewport but is cropped when smaller.

Proposed Solution:

Unfortunately, a pure CSS solution is not possible because fixed positioning is inconsistent with the desired alignment behavior. However, using a JavaScript event listener bound to the scroll event can simulate fixed positioning and maintain the desired alignment.

Specifically, we would bind a scroll event listener and manually update the background-position property based on the current scroll position to achieve the effect of fixed positioning while still calculating background-size: cover relative to the container element.

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