According to Jakob Nielsen, when users were asked how various aspects of online ads affected their Web experience, they rated the following attributes most negatively:
| Design Element | Users Answering “Very Negatively” or “Negatively” |
|---|---|
| Pops-up in front of your window | 95% |
| Loads slowly | 94% |
| Tries to trick you into clicking on it | 94% |
| Does not have a “Close” button | 93% |
| Covers what you are trying to see | 93% |
| Doesn’t say what it is for | 92% |
| Moves content around | 92% |
| Occupies most of the page | 90% |
| Blinks on and off | 87% |
| Floats across the screen | 79% |
| Automatically plays sound | 79% |
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