What is the lowest opacity value allowed in CSS?

When adjusting the opacity value of a button in CSS, I have noticed that even when the opacity is reduced to 0.005, the button remains clickable to some extent. However, when reducing the value to 

0.000000000000000000000000000000000001
, the button becomes completely hidden and unclickable.

I suspect that this extremely small float is being rounded to 0, causing the issue. I am concerned about cross-browser compatibility, as what works in one browser may not work in all browsers. Therefore, I need to determine the minimum value that will make the button clickable across ALL browsers.

Does anyone happen to know the universally tolerable minimum opacity value for all browsers?

cssopacity

Answer №1

As mentioned by @zzzzbov, the minimum value is 0.

Please note: When using 0, it indicates "no opacity", so it actually starts from 0.01

The smallest value possible is

opacity: 0.01;

The maximum value is:

opacity: 0.99;

Answer №2

The level of opacity you choose depends on your preference. If you want to create a transparent object, you can set the opacity as follows:

object {
 opacity: 0.6;
}

To add a "hover" effect to the object:

object:hover {
  opacity: 1.0;
}

In my opinion, an opacity of 0.6 should be sufficient.

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