1. ::selection疑似要素のデモ

選択範囲の色が背景に近いと、コピーしたい範囲を認識しづらい When the selection color is too close to the background, it is hard to recognize the range you want to copy.

const text = "When the selection color is too close to the text color, it is hard to recognize the range you want to copy.";
console.log(text);

選択範囲の色が背景色とかぶらない例 An example where the selection color does not blend into the background.

const text = "An example where the selection color does not blend into the text color.";
console.log(text);