Chrome-Extension: iterate through all tabs?

Question

How would I iterate through all tabs a user has open and then check if they have a particular HTML item with id = \'item\'?

Answer 1

This is a not deprecated vanilla way (may 2019):

chrome.tabs.query({}, function(tabs){
        tabs.forEach(tb => {
            chrome.tabs.sendMessage(tb.id, { action: "xxx" });
        });
    });