How can I retrieve the background and border color of the focused HTML element after pressing the tab on a website?

I am seeking to automate the process of conducting website accessibility checks by analyzing the color contrast between the focused element (after pressing tab) and its border color.

Strategy:

  1. Initially, I attempted to take screenshots of the entire website before and after pressing tab.
  2. Subsequently, I utilized computer vision for image comparison and cropping the differences. However, this method proved ineffective on websites with dynamically changing content.

Upon discovering Chrome's built-in functionality of highlighting the focused element with a blue/orange/white border upon tab press to improve user accessibility, I am now exploring the possibility of achieving this through HTML source code instead of relying on image comparison.

The images below display Chrome adding a white border over the focused element while the background color remains green.

Before Tab Press

After Tab Press

htmlcssgoogle-chromemachine-learningcomputer-vision

Answer №1

To achieve this effect, simply utilize the CSS Pseudo-class :focus. This particular class triggers when focus is placed on a tab or form element in a web browser. Different web browsers have default focus rules that are applied unless custom focus rules are explicitly defined for a specific element. In summary, you can control this behavior using CSS :focus.

I trust this information proves to be helpful!

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