What is causing the navigation bar on stackoverflow.com to move suddenly when clicked?

Just noticed the sleek new navigation bar on stackoverflow. Reminds me of the bootstrap design I've been using. However, I've encountered a similar issue on my website where the navigation bar jumps slightly when clicked.

Does anyone have any suggestions on how to address this problem? I haven't delved too deeply into it yet, but I have a hunch that a JavaScript solution could temporarily stabilize the screen until it repaints.

Answer №1

When the navbar appears to "jump" on a webpage, it's because the browser initially assumes there won't be a need for a scrollbar based on the content it's loading. This causes the navbar to temporarily display at full width until enough content is loaded to trigger the appearance of the scrollbar.

On desktop browsers, this results in the navbar being approximately 17px wider than on pages with a scrollbar.

It's important to note: This issue primarily affects wide, pointer-based devices and is not a problem on mobile or touch devices. Any solutions provided should be specifically targeted to desktop, pointer-based devices using media queries or device detection.

There are several methods to address this problem:

  • Set a min-height property for specific elements to help the browser estimate the initial page height accurately.
  • Apply a minimum height of calc(100vh + 1px) to the <body> tag on pages expecting a scrollbar.
  • Use overflow:scroll on the <body> within a media query for pages with a scrollbar.
  • Temporarily hide content above the fold with opacity:0 and reveal it once a certain element has loaded to prevent the scrollbar jump.
  • Consider using a scrollbar plugin to customize the scrollbar appearance without affecting content rendering.
  • Apply a CSS hack within a media query to adjust the navbar positioning and prevent the jump.

Additionally, this issue is sometimes referred to as "the modal overlay navigation bug" when modals use position:fixed and interfere with the scrollbar, causing the navigation to expand to full width.


In my opinion, this issue is a flaw in desktop browser development.

The sidebar should not disrupt the window width calculation and should be designed to overlay content only when necessary or remain separate from the page layout in a visually appealing manner. This problem should have a straightforward solution.

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