The issue with CSS filter invert not functioning properly in Mozilla Firefox is causing complications

I am currently developing a small Firefox add-on designed to make reading pages at night more comfortable. The goal is to invert page colors without affecting images. Here is the code snippet I am using:

document.body.style.filter = "invert(100%)";

var imgs = document.getElementsByTagName("img");

for (var i = 0; i < imgs.length; i++) {
    imgs[i].style.removeProperty("filter"); // This line does not work
    imgs[i].style.filter = "invert(0%)";    // Nor does this line
}

The issue I am facing is that the code is not functioning as intended - the images are still being inverted, even though inspect element in Firefox shows that they have the correct invert(0%) style applied.

javascriptcssfirefox

Answer â„–1

When the body is inverted, all its contents are also inverted. To ensure images display in their original colors, they must be inverted again by applying invert(100%) to them.

It's important to note that this is not related to CSS inheritance; filters actually apply when combining the pixels of the box with its parent. Since images are contained within the <body> box, they will be affected by the inversion as well.

A helpful tip: Consider applying the inversion to the document.documentElement or :root selector – typically representing the <html> node – especially if the body is smaller than the viewport. Additionally, remember to account for frames nested inside inverted documents.

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