Question 1

What CSS filter functions are available?

Accepted Answer

CSS filter supports: blur, brightness, contrast, grayscale, hue-rotate, invert, opacity, saturate, and sepia. You can combine multiple filters in a single filter property, and they are applied in the order listed.

Question 2

Does the CSS filter property affect performance?

Accepted Answer

CSS filters are GPU-accelerated in modern browsers, but heavy blur or multiple stacked filters can impact rendering performance, especially on mobile. For animations, prefer will-change: filter to hint the browser to optimize.

Question 3

Can I apply CSS filters to background only (not child elements)?

Accepted Answer

No, the filter property applies to the entire element including its children. To filter only the background, use backdrop-filter for a glassmorphism effect, or isolate the background in a separate pseudo-element.

Question 4

What is the difference between filter: opacity() and the opacity property?

Accepted Answer

Both control transparency, but filter: opacity() uses hardware acceleration and can be combined with other filter functions. The opacity property is simpler and creates a new stacking context. For standalone opacity, the opacity property is usually preferred.

Question 5

Can CSS filters be used on SVG elements?

Accepted Answer

Yes. CSS filters apply to SVG elements just like HTML elements. Additionally, SVG has its own filter primitives (feBlur, feColorMatrix, etc.) that offer more fine-grained control than CSS filter shortcuts.

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