"Wolfram|Alpha doesn't know how to interpret your input" by ComposeSeries

Questions
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1

I wanted to use “ComposeSeries” function in WolframAlpha.
However I get the answer “Wolfram|Alpha doesn’t know how to interpret your input.”
And it happens even when I copy an example from the reference page ComposeSeries—Wolfram Documentation .
What is wrong? Is there a way to execute it in Wolfram|Alpha?

2

That documentaiton isn’t for Wolfram|Alpha. Wolfram|Alpha doesn’t usually interpret Wolfram Language Code.

Wolfram|Alpha is a natural language engine and doesn’t really have documentation. The closest thing is a pretty complete list of examples at Wolfram|Alpha: Examples by Topic.

If you want to run code that’s documented at reference.wolfram.com, try using the Wolfram Cloud: http://www.wolframcloud.com/