.removeItem creates arbitrary value from state

[AntonioGargaro]

Description

Issue reported before here.

Using window.localStorage.removeItem within the amp-script worker using any value (even if it doesn’t exist) actually creates an item in local storage with that key and a value that is defined somewhere in AMP environment.

It can be reproduced by having the removeItem code within the amp-script JS that is guaranteed to be executed. The expected behaviour would be for this value to just be deleted.

cc @samouri

Reproduction Steps

Added an AMP playground link here. On line 27 I added window.localStorage.removeItem and you can see that the helloworld key to be removed is actually created in localstorage.

Relevant Logs

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Browser(s) Affected

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OS(s) Affected

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Device(s) Affected

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AMP Version Affected

No response

[stale]

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