AdRoll's SendRoll feature announcement

AdRoll is a retargeting and prospecting advertisement platform for businesses. They use a combination of modal windows and tooltips to frequently release new features to existing users. Here's how they use modal windows:

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What we like: these modal windows are brief and informative, and consistent with the rest of the product design-wise. Plus, with a transparent background, these modal windows allow users to keep an eye on their end goal while they read about the new feature.