html - DIV not taking 100% viewport height -

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as can see on this jsfiddle try div ground picture taking 100% of viewport head (the goal achieve something this)

unfortunately i've tried various things without success (i.e. change height of element-1 100%, method described here, etc.). issue?

many thanks

html

<header>     <div class="element element-1"></div>     <div class="article-titles">       <h1 class="title">head text</h1>       <h2 class="subtitle">sub-head text</h2>     </div>   </header>

css:

.element {   float: left;   width: 100%;   background-size: 100% auto;   background-attachment: fixed; }  .element-1 {   position: relative;   z-index: 8;   height: 600px; <-- i've tried change 100% without success   border-top: 10px solid rgb(0, 0, 0);   background-image: url('http://placehold.it/650x450');   background-position: center center;   background-color: rgb(222, 222, 222); }

changing height of .element-1 100% going heighten 100% of height of parent element.

if want background image cover entire viewport attach <body> or <html>.

if attach <html> cover entire viewport , won't have (and should not in fact) set height attribute on it.


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