Implementation question : Why would changesToReport return false?

[Sunil Agrawal]

Hi,

I am using the library and has been very useful.

However, while debugging one of the issues, I started looking into mutation summary library came around a situation which I don't understand. The Mutation observer (from the browser) is giving about 30 odd mutations and after processing the mutations, the mutation library checks if there are any changes to report, and it's returning false.

My naive question is, under what situations will the incoming mutations not result into summaries being generated?

Thanks in advance,

Sunil

[Rafael Weinstein]

MutationSummary will not report changes even if there are underlying DOM mutations if the effect of the mutations is to negate each other. MutationSummary ALWAYS reports changes relative to the last time it reported. If in that time, some changes were made, but then effectively put back the way they were, it won't report anything -- because from your summary's point of view, nothing has changed.

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