How can I get the current tab URL for chrome extension?

I know there are many similar questions on SO, but I cannot seem to get it working.

I am trying to get the URL of the current tab from my Chrome extension. Hoewever, the alert(tab.url) returns "Undefined". I have added the "tabs" to my permissions in the manifest.json. Any ideas?

<html>
<head>
<script>

    chrome.tabs.getSelected(null, function(tab) {
        tab = tab.id;
        tabUrl = tab.url;

        alert(tab.url);
    });

</script>
</head>

Just an FYI for people from Google:

The method OP uses is deprecated. To get the tab the user is viewing and only in the window they are viewing use this:

  chrome.tabs.query({active: true, currentWindow: true}, function(tabs) {

     // since only one tab should be active and in the current window at once
     // the return variable should only have one entry
     var activeTab = tabs[0];
     var activeTabId = activeTab.id; // or do whatever you need

  });

The problem is in this line:

tab = tab.id;

It should be something like:

var tabId = tab.id;

This is what worked for me:

chrome.tabs.query({
    active: true,
    lastFocusedWindow: true
}, function(tabs) {
    // and use that tab to fill in out title and url
    var tab = tabs[0];
    console.log(tab.url);
    alert(tab.url);
});

How can I get the current tab URL for chrome extension?

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