CSS Dropdown menu tutorial line25.com not working for me -


i'm complete newbie web design , programming , i've been trying make blog page kind of teach myself project. have no particular aim @ point beyond exploring features , working things out myself i'm operating 0 knowledge @ point. found this dropdown menu tutorial end result purportedly this. first tried on blog page project , didn't work, so, decided go through instructions line line replicate effect and, hopefully, in process, discover had gone wrong on first attempt. have followed instructions down colours , styling , yet still doesn't work me! menus won't drop down. using notepad++ , running code notepad++ on firefox. below html , css file. if can tell me going wrong appreciative.

    <html>     <head>         <link rel='stylesheet' href='layout.css'/>     </head> <nav>         <ul>                 <li><a href="#">home</a></li>                 <li><a href="#">tutorials</a></li>                         <ul>                                 <li><a href="#">photoshop</a></li>                                 <li><a href="#">illustrator</a></li>                                 <li><a href="#">web design</a></li>                                         <ul>                                                 <li><a href="#">html</a></li>                                                 <li><a href="#">css</a></li>                                         </ul>                                 </li>                                </ul>                 </li>                 <li><a href="#">articles</a></li>                         <ul>                                 <li><a href="#">web design</a></li>                                 <li><a href="#">user experience</a></li>                         </ul>                 </li>                 <li><a href="#">inspiration</a></li>         </ul> </nav> </html>

css: 

nav ul ul {     display:none; }         nav ul li:hover > ul {             display: block;         }  nav ul {     background: #efefef;     background: linear-gradient(top, #efefef 0%, #bbbbb 100%);     background: -moz-linear-gradient(top, #efefef 0%, #bbbbb 100%);     background: -webkit-linear-gradient(top, #efefef 0%, #bbbbb 100%);     box-shadow: 0px 0px 9px rgba (0,0,0,0.15);     padding: 0 20px;     border-radius: 10px;     list-style: none;     position: relative;     display: inline-table }          nav ul:after {                 content: ""; clear: both; display: block         }  nav ul li {     float: left; }         nav ul li:hover {             background: #4b545f;             background: linear-gradient(top, #4f5964 0%, #5f6975 40%);             background: -moz-linear-gradient(top, #4f5964 0%, #5f6975 40%);             background: -webkit-linear-gradientlinear-gradient(top, #4f5964 0%, #5f6975 40%);         }                  nav ul li:hover a{                     color: #ff                 }         nav ul li {             display: block; padding: 25px 40px;             color: #757575; text-decoration: none;         }  nav ul ul {     background: #5f6975; border-radius: 0px; padding: 0;     position: absolute; top: 100%; }         nav ul ul li {             float: none;             border-top: 1px solid #6b727c;             border-bottom: 1px solid #575f6a;             position: relative;         }                 nav ul ul li {                     padding: 15px 40px;                     color: #fff;                 }                         nav ul ul li a:hover {                             background: #4b545f;                         }      nav ul ul ul {         position: absolute; left: 100%; top:0;     }

the main problem in html code close li tags "tutorials" , "articles".

these whole element , must not close before including sub lists.

here example:

change:

<li><a href="#">tutorials</a></li>     <ul>         <li><a href="#">photoshop</a></li>         <li><a href="#">illustrator</a></li>         <li><a href="#">web design</a></li>             <ul>                 <li><a href="#">html</a></li>                 <li><a href="#">css</a></li>             </ul>         </li>            </ul> </li>

to:

<li><a href="#">tutorials</a>     <ul>         <li><a href="#">photoshop</a></li>         <li><a href="#">illustrator</a></li>         <li><a href="#">web design</a>             <ul>                 <li><a href="#">html</a></li>                 <li><a href="#">css</a></li>             </ul>         </li>     </ul> </li>

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