Water and dust resistance rating
The component can then be loaded in JavaScript as a module. The image decoder interface we defined is accessible to JavaScript, and can be used as if you were importing a JavaScript library to do the task.
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Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.