Issue with Keyboard Navigation in Code Blocks

[Shylejasatheesan]

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I've encountered an issue with keyboard navigation within code blocks on GitHub. When using the Tab key to navigate through code blocks, the focus sometimes jumps to unexpected elements, such as the next code block or the page header.

Steps to Reproduce:

Navigate to a repository with multiple code blocks.
Use the Tab key to move focus into a code block.
Continue pressing the Tab key to navigate within the code block.
Expected Behavior:
The focus should move sequentially through the code elements, such as lines of code, keywords, and comments.

Actual Behavior:
The focus jumps to unexpected elements, making it difficult to navigate the code using the keyboard.

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