Which is better background fixed on a section : background attachment fixed (CSS) or img tag with position fixed? | SoloLearn: Learn to code for FREE!
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background position not centering while background-attachment fixed applied? - Stack Overflow
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背景固定（background-attachment: fixed;）と要素固定（position: fixed;）が効かなくなる問題 | toMemo - メモ的に色々書いていく個人ブログ
Chrome issue with background-attachment fixed and position fixed elements - Stack Overflow
background-attachment: fixed がスマホで効かない問題は ::before で解決！ | ＊Web Design 覚え書き＊
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Fixed Background Effect With background-attachment
