=IFERROR(IMPORTXML("https://www.youtube.com/watch?v=EJVSx6CUFFc";
"(//*[contains(@class,'like-button-renderer-like-button')])[1]");0)=IF(
ISNA(IMPORTXML("https://www.youtube.com/watch?v=EJVSx6CUFFc";
"(//*[contains(@class,'like-button-renderer-like-button')])[1]"));
0;
IMPORTXML("https://www.youtube.com/watch?v=EJVSx6CUFFc";
"(//*[contains(@class,'like-button-renderer-like-button')])[1]")
)/**
* Get an array of all LinkUrls in the document. The function is
* recursive, and if no element is provided, it will default to
* the active document's Body element.
*
* @param {Element} element The document element to operate on.
* .
* @returns {Array} Array of objects, vis
* {element,
* startOffset,
* endOffsetInclusive,
* url}
*/
function getAllLinks(element) {
var links = [];
element = element || DocumentApp.getActiveDocument().getBody();
if (element.getType() === DocumentApp.ElementType.TEXT) {
var textObj = element.editAsText();
var text = element.getText();
var inUrl = false;
for (var ch=0; ch < text.length; ch++) {
var url = textObj.getLinkUrl(ch);
if (url != null) {
if (!inUrl) {
// We are now!
inUrl = true;
var curUrl = {};
curUrl.element = element;
curUrl.url = String( url ); // grab a copy
curUrl.startOffset = ch;
}
else {
curUrl.endOffsetInclusive = ch;
}
}
else {
if (inUrl) {
// Not any more, we're not.
inUrl = false;
links.push(curUrl); // add to links
curUrl = {};
}
}
}
}
else {
var numChildren = element.getNumChildren();
for (var i=0; i<numChildren; i++) {
links = links.concat(getAllLinks(element.getChild(i)));
}
}
return links;
}