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class4.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Class 4 ~ HTML/CSS ~ Girl Develop It</title>
<meta name="description" content="This is curriculum for the GDI RDU intro to web series. It was developed from the official Girl Develop It Core HTML/CSS curriculum">
<meta name="author" content="Girl Develop It">
<meta name="apple-mobile-web-app-capable" content="yes" />
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
<link rel="stylesheet" href="css/reveal.css">
<link rel="stylesheet" href="css/theme/simple.css" id="theme">
<link rel="stylesheet" href="css/custom.css">
<!-- For syntax highlighting -->
<!-- light editor--><link rel="stylesheet" href="lib/css/light.css">
<!-- dark editor<link rel="stylesheet" href="lib/css/dark.css"> -->
<!-- <link rel="stylesheet" href="lib/css/zenburn.css"> -->
<link rel="stylesheet" href="plugin/accessibility-helper/css/accessibility-helper.css">
<!-- If the query includes 'print-pdf', include the PDF print sheet -->
<script>
if( window.location.search.match( /print-pdf/gi ) ) {
var link = document.createElement( 'link' );
link.rel = 'stylesheet';
link.type = 'text/css';
link.href = 'css/print/pdf.css';
document.getElementsByTagName( 'head' )[0].appendChild( link );
}
</script>
<!-- If use the PDF print sheet so students can print slides-->
<link rel="stylesheet" href="css/print/pdf.css" type="text/css" media="print">
<link rel="icon" type="image/x-icon" href="favicon.ico" />
<!--[if lt IE 9]>
<script src="lib/js/html5shiv.js"></script>
<![endif]-->
</head>
<body>
<div class="reveal">
<div class="slides">
<section>
<img src="img/circle-gdi-logo.png" alt="GDI Logo" class="noborder">
<h1>Intro to HTML/CSS</h1>
<h2>Class 4</h2>
</section>
<section>
<h3>Static Positioning</h3>
<ul>
<li>HTML elements are positioned static by default.</li>
<li>Static elements are positioned in the normal flow of the page</li>
<li>Static elements ignore top, bottom, right or left property specifications.</li>
</ul>
</section>
<section>
<h3>Static Positioning</h3>
<p>In normal flow, inline boxes flow from left to right, wrapping to next line when needed.</p>
<pre><code class="html"><img src="img/cookie1.png"/>
<img src="img/cookie2.png"/>
<img src="img/cookie3.png"/>
...
<img src="img/cookie2.png"/>
<img src="img/cookie3.png"/>
</code></pre>
<img src="img/cookie1.png" alt="Stocking-shaped cookie"/>
<img src="img/cookie2.png" alt="Tree-shaped cookie"/>
<img src="img/cookie3.png" alt="Snowflake-shaped cookie"/>
<img src="img/cookie1.png" alt="Stocking-shaped cookie"/>
<img src="img/cookie2.png" alt="Tree-shaped cookie"/>
<img src="img/cookie3.png" alt="Snowflake-shaped cookie"/>
<img src="img/cookie1.png" alt="Stocking-shaped cookie"/>
<img src="img/cookie2.png" alt="Tree-shaped cookie"/>
</section>
<section>
<h3>Static Positioning</h3>
<p>In normal flow, block boxes flow from top to bottom, making a new line after every box.</p>
<pre><code class ="html"><p>Greetings</p>
<p>Hello</p>
<p>Hi there!</p>
</code></pre>
<p>Greetings</p>
<p>Hello</p>
<p>Hi there!</p>
</section>
<!-- Relative Positioning-->
<section>
<h3>Relative Positioning</h3>
<ul>
<li>Takes the element out of the normal flow, allowing it to be moved to the top, left, right or bottom. </li>
<li>Does not affect the elements surrounding it.</li>
<li>Makes an element a "positioning context" in which to position other elements relative to it.</li>
<li>Relative positioning and absolute positioning are used together.</li>
</ul>
</section>
<section>
<h3>Relative Positioning</h3>
<p>The "relative" value will still put the element in the normal flow, but then offset it according to top/left/right/bottom properties.</p>
<pre><code class="css">.relative{
position: relative;
left: 80px;
top: 20px;
height: 100px;
background-color: yellow;
}
</code></pre>
<div style="border:2px solid black;">
<div style="position: relative; left: 80px; top: 20px; height: 100px; background-color: yellow; color:black; text-align:left">
Hello, hi!
</div>
</div>
</section>
<!-- Absolute positioning-->
<section >
<h3>Absolute Positioning</h3>
<ul>
<li>Positions element outside of the normal flow.</li>
<li>An absolutely positioned element is offset from its container block, positioned relative.</li>
<li>Its container block is the first element that has a position other than static.</li>
<li>If no such element is found, the container block is <html>.</li>
<li>Other elements act as if it's not there.</li>
<li>Determined by its offset values in the properties top, bottom, right and left.</li>
</ul>
</section>
<section style="border: 1px solid black">
<h3>Absolute Positioning</h3>
<p>The "absolute" value will take the element out of the normal flow and position it in relation to the window (or the closest non-static element).</p>
<pre><code class="css">.top{
position: absolute;
top: -40px;
right: 10px;
background-color: yellow
}
.bottom{
position: absolute;
bottom: -40px;
left:60px;
background-color: green
}
</code></pre>
<div>
<div style="position: absolute; top: -40px; right: 10px; background-color: yellow; color:black">
Up here
</div>
<div style="position: absolute; bottom: -40px; left:60px; background-color: green">
Down here
</div>
</div>
</section>
<section>
<h3>Example: Absolute Positioning</h3>
<div class="halfblock">
<p>Here's an example of an image with a caption absolutely positioned over top of it.</p>
<p>The containing div has a position of relative, and the caption has a position of absolute.</p>
</div>
<div class="halfblock">
<img src="img/example-absolute.png" class="noborder" alt="Photo with caption overlayed on top"/>
</div>
<div class="clear"></div>
</section>
<section>
<h3>Z-index</h3>
<p>Sometimes elements overlap. You can change the order of overlapping with z-index. The element with highest z-index goes on top.</p>
<pre><code class ="css">.bottom{
position: absolute;
bottom: 10px;
left:60px;
background-color: yellow;
}
.top{
position: absolute;
bottom: 15px;
left:60px;
background-color: green;
z-index: 2;
}
</code></pre>
<div style="position: absolute; bottom: -20px; left:60px; background-color: yellow; color:black">Bottom</div>
<div style="position: absolute; bottom: -15px; left:60px; background-color: green; z-index: 2; ">Top</div>
</section>
<section>
<h3>Let's Develop it!</h3>
<p>Let's add some positioning.</p>
<p>Let's create a div that contains an image and a caption, and position the caption absolutely overtop the image.</p>
</section>
<!-- Float-->
<section>
<h3>Float</h3>
<ul>
<li>"Floating" an element takes it in the normal flow, as far to the left or right of it's containing element as possible.</li>
<li>Any other elements, such as paragraphs or lists, will wrap around the floated element.</li>
<li>Always specify a width when floating an element, otherwise the element is likely to take up the whole page and not appear floated.</li>
<li>You can specify a) whether an element is floated or not, and b) which side it floats on.</li>
</ul>
</section>
<!--example float-->
<section>
<h3>Float: Example</h3>
<p>Below a <blockquote> is floated to the left, allowing text to wrap around it on the right</p>
<img src="img/example-floatbq.png" alt="example float" />
</section>
<section>
<h3>Float</h3>
<pre><code class="css">.float{
float:left;
width:200px;
background:yellow;
}
</code></pre>
<div style ="float:left; text-align: left;width:200px;background:yellow; color:black; padding: 10px;">
<small>Hi, I'm a yellow box with black text.<br/>
I like to hang out on the left side.</small>
</div>
<div class="left-align">Not floating element</div>
<div class="left-align">Not floating element</div>
<div class="left-align">Not floating element with wrapping Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. </div>
</section>
<section>
<h3>Placing elements side by side</h3>
<p>If you want two block level elements to be side by side, you need to float both elements. One left, and one right.</p>
<div style="border:5px solid black; padding:20px; width:720px; height:160px; margin:0 auto;">
<div style="background-color: #688836; color: white; width:300px; height:160px; margin-right:20px; float:left;">
<p>width: 300px;<br />
float: left;</p>
</div>
<div style="background-color: #C3C3C3; width:400px; height:160px; float:right;">
<p>width: 400px;<br />
float: right;</p>
</div>
</div>
</section>
<!-- Clear-->
<section>
<h3>Clear</h3>
<ul>
<li>Clearing tells the element on which side (right, left, both) other elements <strong>cannot</strong> appear. </li>
<li>If you had an image floated left, and you did not want the paragraph to appear next to it, you would add <strong>clear: left;</strong> to the paragraph.</li>
<li>Clearing both sides makes sure floats don’t flow past the clear element.</li>
</ul>
<pre><code class="css">clear: right;
clear: left;
clear: both;
</code></pre>
</section>
<section>
<h3>Clear</h3>
<pre><code class ="css">.float{
float:left;
width:50px;
background:yellow;
}
.clear-left{
clear:left
}
</code></pre>
<div style ="float:left;width:50px;background:yellow; color:black; ">
hi<br/>
hi<br/>
hi
</div>
<div class="left-align">Not floating element</div>
<div class="left-align">Not floating element</div>
<div class="left-align" style="clear: left;">Non-floating element with a class of <strong>.clear-left</strong></div>
</section>
<!-- Exercise-->
<section>
<h3>Let's Develop It</h3>
<p>Let's float our side bar and content areas.</p>
</section>
<section>
<h2>Questions?</h2>
</section>
</div><!-- Close slides -->
<div>
<footer>
<div class="copyright">
HTML/CSS ~ Girl Develop It
<a rel="license" href="http://creativecommons.org/licenses/by-nc/3.0/deed.en_US"><img alt="Creative Commons License" style="border-width:0" src="http://i.creativecommons.org/l/by-nc/3.0/80x15.png" /></a>
</div>
</footer>
</div>
</div><!-- Closes Reveal -->
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