Thanks for filing the issue!

@Reporter: Could you please share a sample test file/extension which helps us to triage the issue in a better way. Any further inputs from your end may be helpful.

Thank you for providing more feedback. Adding the requester to the cc list.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

@vamshi.kommuri, thanks for your response.

Here are my codes calling DOM.getDocument in background.js:

var tab_id = 2;
chrome.debugger.attach({tabId: tab_id}, "1.3", onAttach.bind(null, tab_id));
chrome.debugger.sendCommand({tabId: tab_id}, 'Page.enable');
chrome.debugger.sendCommand({tabId: tab_id},
                            'DOM.getDocument', {"depth": -1, "pierce": true},
                            function(response) {
                                console.log('DOM.getDocument: ', response);
                                handleDOMTree(response.root);
                            });

With these codes in the extension, when you open one page in your browser,  handleDOMTree callback function will be called.
In handleDOMTree, we can try to query DOM node by css selector, here is an example:

function handleDOMTree(n) {
    var body = n;
    for(var j = 0 ; j < n.childNodeCount; j ++){
        if (n.children[j].localName == "body"){
            // found body
            body = n.children[j];
        }
    }
    chrome.debugger.sendCommand({tabId: tab_id}, 'DOM.querySelector', {
        "nodeId": body.nodeId,
        "selector": ".tid-summary-navi-tab-header a"   // replace it to an valid css selector on your page
    }, function(response) {
        var nodeId = response.nodeId;
        console.log("Got node : ", response);                               // Need a way to get coordinate with nodeId here
    });
}

Any idea about it? I want to get coordinate based on a DOM.Node from debugger interface.

Reporter@ - As per comment #4, please provide a sample test file/extension zip file to test the issue from TE-end.
This will help us in triaging the issue further.

Thanks...!!

I think DOM.getBoxModel should work for you. Thanks for filing an issue!

@dgozman, thanks, I can get the element rect and click it now.