One of the easiest visual effects to create is a color alternator, which switches between two color schemes in a frame. This effect is best used in small frames containing large, bold headlines. It should not generally be used with smaller, detail text, as it will make such text difficult to read while the effect is in progress.
It would also be wise to use this effect in moderation-a brief burst of alternating colors can be very effective when your page first loads, when making a transition to a new topic, or to underscore a point. However, continuous flashing quickly becomes annoying to the viewer.
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