driver.findElement(By.id("myid"));
driver.findElement(By.linkText("text of a link"));

var link = element.findElement(firstVisibleLink);

 function firstVisibleLink(element) {
   var links = element.findElements(By.tagName('a'));
   return promise.filter(links, function(link) {
     return link.isDisplayed();
   });
 }