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Hyperlink

<a> specifies a clickable hyperlink to an external site. ( for 'anchor')
......href=URL#tag_id
......hreflang
......type=MIME_type
......referrerpolicy
......download[=filename]:download;don't navigate to
......ping=space-separated list of URLs to track
...... target= {
         _blank: in a new window or tab |
         _parent: in the parent frame |
         _self: in the current frame |
         _top: in the full-body |
         (framename): in the named frame }
...... rel={
         alternate: alternative page |
         author: author and contact |
         bookmark: permalink for <article> |
         external: another domain |
         help: further information |
         license: copyright information|
         next: next resource|
         nofollow: tells search engines not to follow |
         noopener: do not set Window.opener to prevent destination page from accessing current page |
         noreferrer: no HTTP Referer header |
         opener: set Window.opener |
         prev: preceding resource |
         search: links to a search tool |
         tag: describes a tag that applies to this document }


RESETRUNFULL
<!DOCTYPE html><html><head>
   <title>Hyperlinking</title></head><body>
   Click <a href="https://html.spec.whatwg.org/#htmlanchorelement" rel="help">here</a> for more information.
   <p>You can run JavaScript on a URL attribute like
      <a href="javascript:alert('hi');">this</a>.</p>
   <p>You can send an email like
      <a href="mailto:testing@example.com?subject=Hi&body=Hi">this</a>.</p>
   <p>You can initiate a call session on a smart phone like
       <a href="tel:+35453654">this</a>.</p>
   <p>You can initiate an SMS session on a smart phone like
      <a href="sms:35453654?body=hello">this</a>.</p>
   <p>You can initiate a WhatsApp session on a smart phone like
      <a href="https://wa.me/44165522077?text=Hi">this</a>, 
	  where +44 is the country code. <i>(For this demo to work, first click the FULL button above the code editor.</i></p>
   <p>You can initiate a Skype session like
      <a href="skype:userid?chat">this</a>. 
      Besides 'chat', other actions include 'add', 'call', 'sendfile', 'userinfo', and 'voicemail'.</p>
   <p>You can download a file like
      <a href="/shared/testing.gif" download>this</a>.</p>
</body></html>


It is also possible to download YouTube videos through third-party websites. As of 22 Mar 2020, to use these converter services directly, modify the URL of the YouTube video:

  1. add "ss" before "youtube"
    2.        OR
  2. add "pwn" before "youtube"
    3.        OR
  3. change "youtube" to "youpak"

For instance, to obtain the URL of the download link for the YouTube video at https://www.youtube.com/watch?v=ryhnK-iDybE,
go to https://www.ssyoutube.com/watch?v=ryhnK-iDybE

Right-click the Download button, and copy the link address. Then paste it in an <a> tag.


Notice also that <a>...</a> can contain non-textual contents such as the <div> and <img> elements.
RESETRUNFULL
<!DOCTYPE html><html><body>
   <a download href="/shared/neptune.jpg">
      <div>Download<br/>
         <img src="/shared/submit.jpg"/>
      </div>
   </a>
</body></html>