Should we remove lastModified, ClipboardItemDelayedCallback, createDelayed and delayed?

[snianu]

lastModified, createDelayed, ClipboardItemDelayedCallback and delayed are not implemented in Chromium and Safari. Should we remove it? We can probably add it when we implement the delay rendering feature, but I think it should go through the incubation process before we decide to add it back to the spec i.e. we should discuss with the Editing WG, go through the intent to implement process and get consensus from other browser vendors etc. Thoughts?
@whsieh @mkruisselbrink @mbrodesser @BoCupp-Microsoft

[mkruisselbrink]

Since nobody implements them, yes, I think removing them makes a lot of sense.

[mbrodesser]

Gecko/Firefox also doesn't implement them (https://searchfox.org/mozilla-central/rev/36aa22c7ea92bd3cf7910774004fff7e63341cf5/dom/webidl/Clipboard.webidl#31,40-42,45-46). Would appreciate removing them.

[snianu]

Removed from the clipboard spec in #158