What is the meaning of "crowd-pleaser" in this sentence, please?
The primitive demonstrations of electricity never failed as a crowd pleaser

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A crowd-pleaser is something or someone who pleases the crowd (crowd=audience).

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معناها أنها تروق للذوق العام
A person, spectacle, work, or idea that appeals to popular taste.
يعني تعجب عامة الناس

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I'm not really sure about the context of this question, or better said how "crowd pleaser" fits into it, but in general, something that is a crowd pleaser is something that is liked or enjoyed by lots of people. That song is a crowd pleaser is very common for example.

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