Frames must have an accessible name
How to Fix the Problem
  Ensure all frame and iframe elements have valid
  title attribute values.
You can add a title attribute to a frame element as follows:
<iframe ... title="myFrame"> frame body </iframe>
  Additionally, best practice is to give the enclosed document a
  title element with content identical to the title attribute. Some
  screen readers will replace the contents of the title attribute on the frame
  with the contents of the title element inside the frame. As a
  result, it’s safest and most accessible to have the same text in both
  locations.
  A good title is brief, clear, informative, and unique. Ensure that the
  document's title contains short, descriptive text summarizing the
  page's contents. To pass this rule, it’s not sufficient to simply have a
  title element; the element must also contain meaningful text.
Best practices when writing frame titles
- 
    Replace placeholder titles such as untitled pagewith a more appropriate phrase
- Make each title unique - don’t duplicate titles across pages, even if they are similar.
- Put all unique information first. If you want to include the company’s name or brand in the title, this information should go after the unique content. Otherwise, users of screen readers will have to listen to this information over and over as they search for the page that interests them.
- 
    Make the page title match the top heading (ideally labeled as
    h1) on your page. These don’t need to be identical, but it often makes sense to make them very similar, since thetitleandh1elements serve essentially the same purpose.
Why it Matters
  Screen reader users rely on a frame title to describe the contents of the
  frame. Navigating through frame and
  iframe elements quickly becomes difficult and confusing for users
  of this technology if the markup does not contain a
  title attribute.
Screen reader users have the option to pull up a list of titles for all frames on a page. Adding descriptive, unique titles allows users to quickly find the frame they need. If no titles are present, navigating through frames can quickly become difficult and confusing. If no title is listed, screen readers will instead give information like “frame,” “JavaScript,” the filename, or the URL. In most cases, this information won’t be very helpful.
Rule Description
  All frame or iframe elements in the document must
  have a title that is not empty to describe their contents to screen reader
  users.
The Algorithm (in simple terms)
  Ensure that all iframe and frame elements contain a
  unique and non-empty title attribute.
 
              

