[CEReactions] and IDL attribute

[dSalieri]

In the spec we have the following:

The [CEReactions] extended attribute must take no arguments, and must not appear on anything other than an operation, attribute, setter, or deleter. Additionally, it must not appear on readonly attributes.

When attribute applies in IDL it often means the both get and set functions for potential property. But get can't affect to DOM (for the same reason why attribute getter is never used with [CEReactions])

First question: When [CEReactions] is applied to attribute, does it mean that get function will be decorated with [CEReactions] decorator? Sure I don't speak when attribute has readonly, it's obvious.

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The second one:

To ensure custom element reactions are triggered appropriately, we introduce the [CEReactions] IDL extended attribute. It indicates that the relevant algorithm is to be supplemented with additional steps in order to appropriately track and invoke custom element reactions.

So [CEReactions] need for correct tracking mutation of custom elements.

Well let's take data element and its value attribute. This attribute decorated with [CEReactions].

Second question: How does value attribute affect on our custom element, if we just change value via js?