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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/Window/scrollByLines below:

Window: scrollByLines() method - Web APIs

Window: scrollByLines() method

Non-standard: This feature is not standardized. We do not recommend using non-standard features in production, as they have limited browser support, and may change or be removed. However, they can be a suitable alternative in specific cases where no standard option exists.

The Window.scrollByLines() method scrolls the document by the specified number of lines.

Syntax Parameters
lines

The number of lines to scroll the document by. It may be a positive or negative integer.

Return value

None (undefined).

Examples
<button id="scroll-up">Up 5 lines</button>
<button id="scroll-down">Down 5 lines</button>
document.getElementById("scroll-up").addEventListener("click", () => {
  window.scrollByLines(-5);
});
document.getElementById("scroll-down").addEventListener("click", () => {
  window.scrollByLines(5);
});
Specifications

This is not part of any specification.

Browser compatibility See also

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