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The filter property provides graphical effects like blurring, sharpening, or color shifting an element. Filters are commonly used to adjust the rendering of images, backgrounds, and borders.
CSS CSS Property filter Reference SVG SVG Filter


The backdrop-filter property provides for effects like blurring or color shifting the area behind an element, which can then be seen through that element by adjusting the element's transparency/opacity.
CSS CSS Property Graphics Layout NeedsContent NeedsLiveSample NeedsMobileBrowserCompatibility Reference SVG SVG Filter Web


The createIIRFilter() method of the AudioContext interface creates an IIRFilterNode, which represents a general infinite impulse response (IIR) filter which can be configured to serve as various types of filter.
API audio Audio AudioContext CreateIIRFilter filter Method Reference Web Audio API