I have a page with a whole bunch of blackquote tags.
In dev console I am typing document.getElementsByTagName("blockquote") that giving me an array. 
But if I do document.getElementsByTagName("blockquote").innerText document.getElementsByTagName("blockquote").innerHTML document.getElementsByTagName("blockquote").textContent
document.getElementsByTagName("blockquote").outerText document.getElementsByTagName("blockquote").outerHTML 
All return undefined  
However if I inspect elements of the array document.getElementsByTagName("blockquote") I can see all above properties in place.
How to access at least one of them (innerText, outerHTLM, innerText, outerHTML, textContent) ?
Or if you want to access any specific element you can use index in array
for (var i=0; i <document.getElementsByTagName("blockquote").length; i++ ){
    var singleElement = document.getElementsByTagName("blockquote")[i];
    console.log(singleElement.innerHTML);
}
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