Element.getElementsByTagName()

elements = element.getElementsByTagName(tagName);

• elements is a live HTMLCollection of found elements in the order they appear in the sub-tree. If no elements were found, the HTMLCollection is empty.
• live HTMLCollection .
• element is the element from where the search should start. Note that only the descendants of this element are included in the search, but not the element itself.
• . .
• tagName is the qualified name to look for. The special string "*" represents all elements. For compatibility with XHTML, lower-case should be used.
• tagName . "*" . XHTML , .

Example

// check the alignment on a number of cells in a table.
var table = document.getElementById("forecast-table");
var cells = table.getElementsByTagName("td");
for (var i = 0; i < cells.length; i++) {
  var status = cells[i].getAttribute("data-status");
  if (status == "open") {
    // grab the data
  }
}

Specifications

Browser compatibility