Echo JS 0.11.0

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This is off topic.

Anyway, the given code *does* render a perfectly centered button. Use button.getBoundingClientRect() to verify that.

Small correction:

    // 3 * obj.nonexistentProperty === undefined

It's actually === NaN.

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Off topic.

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A digital SPAM

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It's a Python tool and yet you post it on Echo *JS*.