Why Do My Input Field Borders Disappear in Chrome When Zooming?

Chrome's Elusive Borders: Troubleshooting Disappearing Input Boundaries

Users accessing a simple form through Chrome may encounter an issue where input element borders vanish upon zooming in or out. This phenomenon is observed around a 90% zoom level. The cause of this behavior has sparked debates, with some attributing it to CSS issues and others alleging a Chrome bug.

The Root of the Problem

The root cause of this behavior seems to lie in the browser's rendering engine. When using the "thin" keyword to specify border width, Chrome interprets it as a specific pixel value (often around 1px), which is subject to rounding errors during zoom operations. This can result in the border thickness becoming zero, effectively hiding the element's boundaries.

A Simple Solution

To address this issue, a simple CSS adjustment is recommended. Instead of using "thin," specify the border width using a specific pixel value. For instance, changing the CSS code from:

INPUT, TEXTAREA {
  border-top: thin solid #aaa;
}

to:

INPUT, TEXTAREA {
  border-top: 1px solid #aaa;
}

should resolve the problem. By defining the border width explicitly, you circumvent Chrome's rounding errors and ensure consistent border visibility across different zoom levels.

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