html - How Does This CSS Only Parallax Work? -


i've created parallax scrolling effect using css. i'm struggling understand why it's working. can explain.

html

<div class="image"></div> <section class="content">     <p>text goes here</p>        </section>

css

.image {     background: url('http://s28.postimg.org/v6mfcxbyl/galaxy.jpg') no-repeat fixed;     background-position: center center;     -webkit-background-size: cover;     -moz-background-size: cover;     -o-background-size: cover;     background-size: cover;     min-height: 500px; } .content {     width: 100%;     max-width: 750px;     margin: 0 auto;     background: #fff;     box-sizing: border-box;     -moz-box-sizing: border-box;     position: relative;     z-index: 2;     background: #fff;     width: 100%; }

it looks has setting background fixed on image div.

here's working fiddle http://jsfiddle.net/pajnr/

position:fixed , background-attachment:fixed mean element not move in relation viewport. scroll, title (position:fixed) , background image (background-attachment:fixed) not move. thing move text (.content) doesn't have position:fixed.

when text crosses on title, has higher z-index (and position:relative z-index not ignored) hides whatever underneath (the title).


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