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Provides a hint to the implementation about how to make speed vs. quality tradeoffs as it performs image processing.
Auto: 0;
Indicates that the user agent shall make appropriate tradeoffs to balance speed and quality, but quality shall be given more importance than speed.
OptimizeQuality: 1;
Indicates that the user agent shall emphasize quality over rendering speed.
OptimizeSpeed: 2;
Indicates that the user agent shall emphasize rendering speed over quality.