How to Simulate CSS `background-attachment: fixed` on iOS?

How to Replicate Fixed Background-Attachment on iOS

Despite CSS's background-attachment: fixed property, enabling fixed background images on iOS devices remains a challenge. The standard method results in irregular sizing and the absence of scrolling effects.

One successful implementation can be found at everyonedeservesgreatdesign.com. However, their Squarespace template obfuscates the underlying code. Analysis suggests that they embed images within a position:fixed div, clipped by a position:relative parent div.

Contrary to expectations, position:fixed divs can be clipped by their position:relative parent. This behavior, unique to iOS, offers a potential workaround.

To achieve a fixed background on iOS:

1. Create a position:fixed Div: Insert a div with absolute positioning and a fixed background into the DOM.
2. Clip the Div: Use CSS to clip the fixed div using its position:relative parent div. This prevents the background from extending past the parent's boundaries.
3. Position and Size the Div: Carefully position and size the fixed div to ensure it aligns with your intended background.

While it's possible to implement this method, it's important to note that fixed backgrounds significantly impact performance on mobile browsers. Therefore, consider using alternative solutions or avoiding fixed backgrounds altogether. Refer to the suggested workarounds in the linked posts for additional guidance on optimizing performance for iOS devices.

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