"get links of" only returns unique links?

DEVONthink Automation
4

If you really want all “links” (and you probably mean a elements, if you say that – or do you also want link elements?), you could use fairly simple JavaScript code and send that to the tab with do JavaScript:

const aElements = document.querySelectorAll("a"); 
JSON.stringify([...aElements].map(a => a.href));

Note that this returns a JSON string, as you can’t return lists or anything more complicated than string, number or boolean to a do JavaScript call.

As shown in an older thread, a complete JavaScript script could look like this:

(() => {
  const app = Application("DEVONthink 3")
  app.includeStandardAdditions = true;
  const record = app.selectedRecords[0];
  const tw = app.openWindowFor({record: record});
  const script = `const aElements = document.querySelectorAll("a"); 
    JSON.stringify([...aElements].map(a => a.href))`;
  const result = app.doJavaScript(script, {in: tw});
  console.log(result);
})()

I don’t bother doing that in AppleScript, since the list of href values is a JSON string, which is probably a PITA to convert to a list in AS. In JS, you’d use
const arrayOfHrefs = JSON.parse(result);

And then you can do whatever you want with the list of URIs.