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index.2018.html
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<!DOCTYPE HTML>
<html>
<head>
<!--[if gte IE 9]><meta http-equiv="X-UA-Compatible" content="IE=edge" /><![endif]-->
<!--[if lt IE 9]><meta http-equiv="X-UA-Compatible" content="IE=edge;chrome=1" /><![endif]-->
<meta charset="utf-8" />
<title>Selectors: Select This!</title>
<link href='https://fonts.googleapis.com/css?family=Rum+Raisin' rel='stylesheet'>
<link href='https://fonts.googleapis.com/css?family=Bigelow+Rules' rel='stylesheet' type='text/css'>
<link rel="stylesheet" href="white.css"/>
<style>
.current * { -webkit-tap-highlight-color: #bada55;}
.thisSlide.foo {
-webkit-tap-highlight-color: #bada55;
-webkit-user-select: none;
-webkit-touch-callout: none;
}
.beforeafter:before {
content: "before - ";
font-weight: bold;
}
.beforeafter:after {
content: " - after";
font-weight: bold;
}
.active {color: red; font-weight: bold; background-color: rgba(0,0,0,0.3)}
#presentation {-webkit-animation: none; background-image: none;}
</style>
</head>
<body>
<!-- Top instructions -->
<div id="topinfo"></div>
<!-- footer instructions -->
<div id="info">
<p><a href="http://standardista.com">Estelle Weyl</a> | <a href="https://twitter.com/estellevw">@estellevw</a> | <a href="https://github.com/estelle">Github</a> | Press <span class="key">→</span> key to advance.</p>
</div>
<div id="presentation">
<div id="presentation-counter"></div>
<div id="slides">
<div class="slide intro">
<header><hgroup>
<h1><span class="textmask">Select This!</span><br> CSS Selectors</h1>
</hgroup></header>
<p><a href="https://estelle.github.com/selectors/" style="color: #000">https://estelle.github.com/selectors/</a></p>
</div>
<div class="slide normal">
<header><h1>Me</h1></header>
<section class="content">
<h1 class="textmask">Estelle Weyl</h1>
<h2><a href="http://www.standardista.com">www.standardista.com</a></h2>
<h2><a href="https://www.twitter.com/estellevw">@estellevw</a></h2>
<h2><a href="https://www.twitter.com/standardista">@standardista</a></h2>
<div style="float:right"><img src="https://akamaicovers.oreilly.com/images/9780987467485/cat.gif" alt="HTML5 and CSS3 for the Real World"><img src="https://akamaicovers.oreilly.com/images/0636920012726/cat.gif" alt="CSS: The Definitive Guide" style="margin: 0 20px;"><img src="https://akamaicovers.oreilly.com/images/0636920021711/cat.gif" alt="MObile HTML5" style="margin: 0 20px;"><img src="https://akamaicovers.oreilly.com/images/0636920025955/cat.gif" alt="Web Performance Daybook"></div>
</section>
</div>
<!-- basics -->
<div class="slide normal">
<header><h1>Selectors</h1></header>
<section class="content">
<pre contenteditable style="font-size:100%; line-height:1.5">selectorA {
property1: value1;
property2: value2;
}
selectorB {
property1: value3;
property2: value4;
}</pre>
</section>
</div>
<div class="slide normal">
<header><h1>Selectors</h1></header>
<section class="content">
<pre contenteditable style="font-size:100%; line-height:1.5">selector:pseudo-class::pseudo-element {
-vendor-property: value;
}
selector[attribute],
selector ~ relation {
property: -vendor-value;
-vendor-property: -vendor-value;
-vendor-property: weirdsyntax;
}</pre>
</section>
</div>
<!-- Basic Selectors-->
<div class="slide normal light" id="slcElement">
<header><h1>Basic Selectors</h1></header>
<section class="content">
<pre contenteditable style="font-size:100%; line-height:1.5"><ul>
<li id="myID" class="myClass">item 1</li>
<li class="myClass">item 2</li>
<li>item 3</li>
</ul> </pre>
<dl class="inline">
<dt><b class="imp">#</b>myID</dt>
<dd>ID</dd>
<dt><b class="imp">.</b>myClass</dt>
<dd>class</dd>
<dt class="imp">li</dt>
<dd>tag name</dd>
</dl>
</section>
</div>
<div class="slide object">
<header><h1>Play Time</h1></header>
<object data="files/00_basics.html"></object>
<a href="files/00_basics.html" target="play" class="objectlink">Try it out</a>
</div>
<!-- selectors in CSS1 -->
<div class="slide">
<header><h1>Selectors in CSS Level 1</h1></header>
<section class="content">
<pre contenteditable style="font-size:100%; line-height:1.5">E
E F
.class
#ID
:link
:active</pre>
</section>
</div>
<!-- Play time
<div class="slide object">
<header>
<h1>Play Time</h1>
</header>
<object data="files/00_basic.html"></object>
<a href="files/00_basic.html" target="play" class="objectlink">Try it out</a>
</div>
<!-- Selector list -->
<div class="slide normal">
<header>
<h1>Lots 'o Selectors</h1>
</header>
<section class="content">
<ul class="columns">
<li style="column-span: all"><h3>CSS Level 1 Selectors</h3></li>
<li>E</li>
<li>.class</li>
<li>#id</li>
<li>E F</li>
<li>:link</li>
<li>:active</li>
<li style="column-span: all"><h3>CSS Level 2 Selectors</h3></li>
<li>*</li>
<li>E > F</li>
<li>E + F</li>
<li>E[attribute]</li>
<li>E[attribute=value]</li>
<li>E[attribute~=value]</li>
<li>E[attribute|=value]</li>
<li>:first-child</li>
<li>:lang(en)</li>
<li>:focus</li>
<li>:hover</li>
<li>:visited</li>
<li>:before</li>
<li>:after</li>
<li>:first-letter</li>
<li>:first-line</li>
</ul>
</section>
</div>
<!-- Selector list -->
<div class="slide normal">
<header>
<h1>Lots 'o Selectors</h1>
</header>
<section class="content">
<ul class="columns">
<li style="column-span: all"><h3>CSS Selects Level 3</h3></li>
<li>::before</li>
<li>::after</li>
<li>::first-letter</li>
<li>::first-line</li>
<li><br/>E[attribute^=value]</li>
<li>E[attribute$=value]</li>
<li>E[attribute*=value]</li>
<li><br/>E ~ F</li>
<li>:root</li>
<li>E:last-child</li>
<li>E:only-child</li>
<li>E:nth-child(n)</li>
<li>E:nth-last-child(n)</li>
<li>E:first-of-type</li>
<li>E:last-of-type</li>
<li>E:only-of-type</li>
<li>E:nth-of-type(n)</li>
<li>E:nth-last-of-type(n)</li>
<li><br/>E:empty</li>
<li>E:not(selector)</li>
<li>E:target</li>
</ul></section></div>
<!-- Selector list -->
<div class="slide normal">
<header>
<h1>Lots 'o Selectors</h1>
</header>
<section class="content">
<ul class="columns">
<li style="column-span: all"><h3>UI / Selectors #4</h3>
<li>E:enabled</li>
<li>E:disabled</li>
<li>E:checked</li>
<li>E:default</li>
<li>E:valid</li>
<li>E:invalid</li>
<li>E:in-range</li>
<li>E:out-of-range</li>
<li>E:required</li>
<li>E:optional</li>
<li>E:read-only</li>
<li>E:read-write</li>
</ul>
</section>
</div>
<div class="slide normal">
<header>
<h1>CSS Selectors Level 4</h1>
</header>
<section class="content">
<ul class="columns">
<li>:blank</li>
<li>:indeterminate</li>
<li>:placeholder-shown</li>
<li>:not(s1, s2)</li>
<li>:matches(s1, s2)</li>
<li>:has(rs1, rs2)</li>
<li>[foo="bar" i]</li>
<li>:dir(ltr)</li>
<li>:lang(zh, *-hant)</li>
<li>:any-link</li>
<li>:scope</li>
<li>:current</li>
<li>:focus-ring</li>
<li>:drop</li>
<li>:drop(active)</li>
<li>:drop(valid)</li>
<li>:drop(invalid)</li>
<li>:user-invalid</li>
<li>E >> F</li>
<li>F || E</li>
<li>:nth-column(n)</li>
<li>:nth-last-column(n)</li>
</ul>
</section></div>
<!-- Selector list -->
<div class="slide normal">
<header>
<h1>More... </h1>
</header>
<section class="content">
<h3>Maybe</h3>
<ul class="columns">
<li>::selection</li>
<li>:scope-context()</li>
<li>:current(s)</li>
<li>:past</li>
<li>:future</li>
<li>:host</li>
<li>:host()</li>
<li>:host-context()</li>
<li>::shadow</li>
<li>::content</li>
<li><s>:column(selector)</s></li>
<li><strike>E /foo/ F</strike></li>
<li><strike>E! > F</strike></li>
<li><s>:local-link</s></li>
<li><s>:nth-match()</s></li>
</ul>
</section>
</div>
<div class="object slide">
<object data="selectors.html"></object>
<header><h1>All the selectors</h1></header>
<a href="selectors.html" target="play" class="objectlink" aria-label="open all the selectors in new window">Open</a>
</div>
<div class="object slide">
<object data="https://specifishity.com/" style="height: 792px;"></object>
<header><h1>Specificity (SpeciFISHity)</h1></header>
<a href="https://specifishity.com/specifishity.pdf" target="play" class="objectlink">Download</a>
</div>
<!-- Specificity Notes -->
<div class="slide normal">
<header><h1>Specificity: How it works</h1></header>
<section class="content">
<ul>
<li><code contenteditable>1-0-0</code>: ID selector</li>
<li><code contenteditable>0-1-0</code>: Class selector (Also attribute selector & pseudoclass)</li>
<li><code contenteditable>0-0-1</code>: Element Selector</li>
<p>The * selector, or global selector, has no value.</p>
<pre contenteditable>* {} 0-0-0 </pre>
<p>Combinators, like ~, >, and + have no value</p>
<pre contenteditable>ul li {} 0-0-2
ul > li {} 0-0-2</pre>
</section>
</div>
<!-- Relational selectors -->
<div class="slide normal" id="slcRelational">
<header><h1>Relational selectors & Combinators</h1></header>
<section class="content">
<div class="ex right">
<ol>
<li>item 1</li>
<li>item 2</li>
<li>item 3
<ul>
<li>item a</li>
<li>item b</li>
<li>item c</li>
</ul>
</li>
<li class="hasaclass">hasaclass</li>
<li>item 5</li>
<li>item 6</li>
<li>item 7</li>
</ol>
</div>
<dl>
<dt><span onclick="hasaclass('ul li');">ul li</span>, <br><span onclick="hasaclass('ol li');">ol li</span></dt>
<dd>descendant selector<br />
matches nested <li>s
</dd>
<dt onclick="hasaclass('ol > li');">ol > li</dt>
<dd><em>child selector</em> <br />
matches <li>s in <ol> but not nested <ul></dd>
<dt onclick="hasaclass('li.hasaclass + li');">li.hasaclass + li</dt>
<dd><em>adjacent sibling</em> </dd>
<dt onclick="hasaclass('li.hasaclass ~ li');"><strong class="new">NEW </strong><span style="background-color:#eee; padding:3px 20px; position:relative; left: 22px; margin-left: -20px;">(IE7+)</span><br />
li.hasaclass ~ li</dt>
<dd><em>general sibling selector</em><br />
matches later siblings, but not nested.</dd>
<dt>E >> F</dt>
<dd>NEW: descendant combinator</dd>
</dl>
</section>
<script defer>
function hasaclass(selector) {
var i = j = 0,
elements = document.querySelectorAll('.current .ex li'),
update = document.querySelectorAll('.current .ex ' + selector);
for (; i < elements.length; i++) {
elements[i].classList.remove('active');
}
for (; j < update.length; j++) {
update[j].classList.add('active');
}
}
</script>
</div>
<div class="slide normal">
<header><h1>Selectors API</h1></header>
<section class="content">
<pre contenteditable>var chil = $('#bar .foo');</pre>
<p>Natively</p>
<pre contenteditable>var el = document.<strong>querySelector</strong>('#bar');
var chil = el.<strong>querySelectorAll</strong>('.foo');</pre>
<p>or</p>
<pre contenteditable>chil = document.<strong>querySelectorAll</strong>('#bar .foo');</pre>
</section>
</div>
<!-- Attribute selectors-->
<div class="slide normal">
<header>
<h1>Attribute selectors</h1>
</header>
<section class="content">
<dl>
<dt>element[attribute]</dt>
<dd>Select elements containing the named attribute</dd>
</dl>
<pre contenteditable style="font-size: 95%;"><strong>img[alt] {}</strong>
<img src="image.jpg" <strong>alt</strong>="accessible">
<span style="opacity:0.3"><img src="image.jpg" title="inaccessible"></span>
<strong>form [type] {}</strong>
<input <strong>type</strong>=date>
<span style="opacity:0.3"><select></span></pre>
</section>
</div>
<!-- Older attribute selectors -->
<div class="slide normal">
<header style="position:absolute; top: 20px; right: 20px;">
<h1>CSS 2 attribute selectors</h1>
</header>
<section class="content">
<dl>
<dt>E[attr]</dt>
<dd>Element E that has the attribute attr with any value.</dd>
<dt>E[attr="val"]</dt>
<dd>Element E that has the attribute attr with the exact, case-sensitive if attribute is case sensitive, value <em>val</em>.</dd>
<dt>E[attr|=val]</dt>
<dd>Element E whose attribute <em>attr</em> has a value <em>val</em> or begins with val- ("val" plus "-").<br />
<pre contenteditable class="example">p[lang|="en"]{/* <p lang="en-us"> <p lang="en-uk"> */ }</pre>
</dd>
<dt>E[attr~=val]</dt>
<dd>Element E whose attribute <em>attr</em> has within its value the space-separated full word <em>val</em>.<br />
<pre contenteditable class="example">a[title~=more] {/* <a title="want more info about this?">}</pre>
</dd>
</dl>
</section>
</div>
<!-- CSS3 Attribute Selectors -->
<div class="slide normal">
<header style="position:absolute; top: 20px; right: 20px;"><h1>Attribute Selectors in CSS Selectors Level 3</h1></header>
<section class="content">
<dl>
<dt>E[attr^=val]</dt>
<dd>Element E whose attribute <em>attr</em> starts with the value <em>val</em>.<br />
<pre contenteditable class="example">a[href^=mailto] {background-image: url(emailicon.gif);}
a[href^=http]:after {content: " (" attr(href) ")";}</pre>
</dd>
<dt>E[attr$=val]</dt>
<dd>Element E whose attribute <em>attr</em> ends in <em>val</em> . <br />
<pre contenteditable class="example">a[href$=pdf] {background-image: url(pdficon.gif);}
a[href$=pdf]:after {content: " (PDF)";}</pre>
</dd>
<dt>E[attr*=val]</dt>
<dd>Element E whose attribute <em>attr </em>matches <em>val</em> anywhere within the attribute. Similar to E[attr~=val] above, except the <em>val</em> can be part of a word.</dd>
</dl>
<p>Note: Multiple attributes work! a[title][href]</p>
</section>
</div>
<!-- CSS4: Attribute Selector -->
<div class="slide">
<header>
<h1>Attribute Selectors 4: Case Insensitivity</h1>
</header>
<section class="content">
<pre contenteditable>E[foo="bar" i]</pre>
<pre contenteditable class="example">input[type=checkbox i]</pre>
<p>Only relevant if attribute value is case senstive <br/>(as it is for all attributes in XHTML)</p>
<p><a href="https://codepen.io/estelle/pen/lEGev" target="_play">CodePen test page</a>
</section>
</div>
<!--
<div class="object slide">
<object data="files/01_attr_caseinsensitiveB.html"></object>
<header><h1>Case Sensitivity</h1></header>
<a href="files/01_attr_caseinsensitiveB.html" target="play" class="objectlink" aria-label="open all the selectors in new window">Open</a>
</div>
selectors css 2
<div class="slide">
<header><h1>Selectors in CSS Level 2</h1></header>
<section class="content" style="line-height: 1.5">
<pre>*
:lang(en)
:hover
:focus
E > F
E + F
:first-child
[attribute]
[attribute="value"]
[attribute~="value"]
[attribute|="en"]</pre>
</section>
</div>
-->
<!-- Attribute Selectors Recap -->
<div class="slide normal">
<header><h1>Attribute Selectors Recap</h1></header>
<section class="content">
<pre contenteditable style="float:left; width: 45%; margin: 0 20px 0 0;">
input[placeholder] {<b class="notes">/* matches any input with a placeholder */</b>}
input[type=email] {<b class="notes">/* exact match */</b>}
abbr[title~=unicorn] {<b class="notes">/* matches unicorn but not unicorns */</b>}
abbr[title|=en] {<b class="notes">/* matches en-us and en-uk */</b>}
a[href^=mailto] {<b class="notes">/* starts with */</b>}
a[href$=pdf]{<b class="notes">/* ends in */</b>}
abbr[title*=unicorn] {<b class="notes">/* matches unicorn and unicorns */</b>}
abbr[title*=UNICORN i] {<b class="notes">/* matches unicorn and UnIcOrNs */</b>}
</pre>
<pre contenteditable style="float:left; width: 40%; margin-top:0;">E:[att] <b class="notes">/* have the attribute at all */</b>
E:[att=val] <b class="notes">/* exact */</b>
E:[att~=val] <b class="notes">/* val is a space separated word */</b>
E:[att|=val] <b class="notes">/* with a dash */</b>
E:[att^=val] <b class="notes">/* begins with val */</b>
E:[att$=val] <b class="notes">/* ends with val */</b>
E:[att*=val] <b class="notes">/* val is anywhere as a substring */</b>
E:[att*=VAL i] <b class="notes">/* anywhere as a case insenstive substring */</b></pre>
<pre contenteditable style="clear:both">
@media print{
abbr[title]:after {
content: "(" attr(title) ")";
}
a[href^=http]:after {
content: "(" attr(href) ")";
}
}</pre>
</section>
</div>
<!-- Using attribute selectors -->
<div class="slide object">
<object data="files/01_attr.html"></object>
<header><h1>Using attribute selectors</h1></header>
<a href="files/01_attr.html" target="play" class="objectlink">Attribute Selectors</a>
<p><strong>Note:</strong> The top line of the example is editable. The CSS will impact the contents on the rest of the page.</p>
</div>
<!-- UI pseudo-classes -->
<div class="slide normal">
<header><h1>UI pseudo-classes</h1></header>
<section class="content">
<p>Based on current state of UI </p>
<pre contenteditable>
:enabled
:disabled
:checked
:indeterminate (Level 4)</pre>
<pre contenteditable class="example">input[type=checkbox]:checked + label {
color: red;
}</pre>
<div style="clear:both;">
<input type="checkbox" id="test1ck"/> <label for="test1ck">Check and Uncheck Me</label><br/>
<input type="checkbox" id="test2ck"/> <label for="test2ck">Check and uncheck me too!</label></div> </section>
<footer>Basic User Interface Module Level 3 (CSS3 UI)</footer></div>
<!--Form related UI pseudo-classes -->
<div class="slide normal">
<header><h1>Form related UI pseudo-classes</h1></header>
<section class="content">
<pre contenteditable style="font-size: 1.8rem;" class="columns">:default
:valid
:invalid
:required
:optional
:in-range
:out-of-range
:read-only
:read-write
:placeholder-shown
:user-invalid</pre>
</section>
</div>
<!--Form related UI pseudo-classes -->
<div class="slide normal">
<header><h1>Form related UI pseudo-classes</h1></header>
<section class="content">
<pre contenteditable class="example">input:valid { border: 1px solid green;}
input:invalid { border: 1px solid red;}
input:required,
input[aria-required="true"] {border-width: 5px;}
input:optional {border-width: 10px;}
input:out-of-range { background-color: pink;}
input:in-range { background-color:lightgreen;}</pre>
<div style="clear:both;">
<input type="number" min="5" max="7" id="test3ck" required/> <label for="test3ck">Number between 5 and 7</label><br>
<input type="number" min="0" step="0.1" max="10" id="test4ck"/><label for="test4ck">Number between 0 and 10</label>
<pre contenteditable class="example"><input type="number" min="5" max="7"
required aria-required="true"/>
<input type="number" min="0" step="0.1" max="10"/>
</pre>
</div> </section>
</div>
<!-- UI selectors -->
<div class="slide object">
<object data="files/02_uiselectors.html"></object>
<header><h1>UI selectors</h1></header>
<a href="files/02_uiselectors.html" target="play">UI Selectors</a></h1>
<p>Test them out for yourselves</p>
<a class="objectlink" href="files/02_uiselectors.html">Open in new page</a>
</div>
<!-- UI selectors -->
<div class="slide object">
<object data="files/02_counting.html?hop"></object>
<header><h1>UI selectors</h1></header>
<a href="files/02_uiselectors.html" target="play">UI Selectors</a></h1>
<p>Test them out for yourselves</p>
<a class="objectlink" href="files/02_counting.html">Open in new page</a>
</div>
<!-- List of Structural selectors -->
<div class="slide normal">
<header><h1>Structural selectors</h1></header>
<section class="content">
<pre contenteditable class="columns2">
:root
:empty
:blank
:nth-child()
:nth-last-child()
:first-child<sup style="color:#C61800"> (2)</sup>
:last-child
:only-child
:nth-of-type()
:nth-last-of-type()
:first-of-type
:last-of-type
:only-of-type
</pre>
<ul><li>Target elements on the page based on their relationships to other elements in the DOM.</li>
<li>Updates dynamically if page updates.</li>
<li>Reduced need for extra markup, classes and IDs</li>
</ul>
</section>
</div>
<!--First, last, & only -->
<div class="slide normal">
<header><h1>First, last, & only</h1></header>
<section class="content">
<pre contenteditable>
:first-child
:last-child
:first-of-type
:last-of-type
:only-child
:only-of-type
</pre>
<p>Easier to explain <a href="files/04_firstlastonly.html" target="play">by example</a></p>
</section>
</div>
<div class="slide object">
<object data="files/04_firstlastonly.html"></object><header><h1>First, last, & only</h1></header>
<a href="files/04_firstlastonly.html" class="objectlink" target="play">First, last and only</a>
</div>
<!--nth pseudo-classes -->
<div class="slide normal">
<header><h1>nth pseudo-classes</h1></header>
<section class="content">
<pre contenteditable class="example">:nth-child(<b>3n</b>)
:nth-last-child(<b>odd</b>)
:nth-of-type(<b>5</b>)
:nth-last-of-type(<b>3n+1</b>) </pre>
<p>Target element or elements based on argument passed to the selector</p>
<ul class="pre">
<li>:nth-of-type(<b>even</b>)</li>
<li>:nth-of-type(<b>odd</b>)</li>
<li>:nth-of-type(<b>an+b</b>) </li>
</ul>
</section>
</div>
<!--Structural Selectors -->
<div class="slide normal">
<header><h1>Structural Selectors</h1></header>
<section class="content">
<pre contenteditable style="margin-top: 0; float: left;">
li:<b>first-child</b>,
li:<b>last-child</b> {
font-weight: bold;
}
li:<b>first-of-type</b>,
li:<b>last-of-type</b>{
text-decoration:line-through;
}
li:<b>nth-child</b>(<b>even</b>) {
background-color: #CCC;
}
li:nth-child(<b>3</b>) {
color: #CCC;
}
li:<b>nth-of-type</b>(<b>odd</b>) {
background-color: #FFF;
}
li:nth-of-type(<b>4n</b>) {
color: hsl(205, 87%, 50%);
}
li:nth-of-type(<b>3n-1</b>) {
text-align: right;
}
</pre>
<ul class="structural" style="float: right; width:33%;">
<li>item 1</li>
<li>item 2</li>
<li>item 3</li>
<li>item 4</li>
<li>item 5</li>
<li>item 6</li>
<li>item 7</li>
<li>item 8</li>
<li>item 9</li>
<li>item 10</li>
</ul>
</section>
</div>
<!--Advanced Structural Selectors -->
<div class="slide normal">
<header><h1>Before Flexbox</h1></header>
<section class="content" style="height: 80%; overflow: scroll;">
<ul class="count"><li>1</li></ul>
<ul class="count"><li>1</li><li>2</li></ul>
<ul class="count"><li>1</li><li>2</li><li>3</li></ul>
<ul class="count"><li>1</li><li>2</li><li>3</li><li>4</li></ul>
<pre contenteditable class="example"> li:only-of-type{width: 100%;}
li:nth-of-type(1):nth-last-of-type(2),
li:nth-of-type(2):nth-last-of-type(1) {width: 50%;}
li:nth-of-type(1):nth-last-of-type(3),
li:nth-of-type(3):nth-last-of-type(1),
li:nth-of-type(2):nth-last-of-type(2) {width: 33.33%;}
li:nth-of-type(1):nth-last-of-type(4), li:nth-of-type(1):nth-last-of-type(4) ~ li {width: 25%;}</pre>
</section>
</div>
<div class="slide object">
<object data="files/05_nth.html"></object>
<header><h1>Structural Selectors</h1></header>
<a href="files/05_nth.html" target="play" class="objectlink">Structural Selectors</a>
</div>
<div class="slide object">
<object data="files/05_flag.html#flag"></object>
<header><h1>Flag with Structural Selectors</h1></header>
<a href="files/05_flag.html" target="play" class="objectlink">USA Flag</a>
</div>
<div class="slide object">
<object data="files/05_flag2.html#flag"></object>
<header><h1>Simpler Flag with Structural Selectors</h1></header>
<a href="files/05_flag2.html" target="play" class="objectlink">USA Flag</a>
</div>
<!-- nth-matchnes()
<div class="slide">
<header><h1>Structural Selectors Level 4</h1></header>
<section class="content double">
<pre contenteditable>E:nth-match(n of selector)
E:nth-last-match(n of selector)</pre>
<pre contenteditable class="example">li:nth-match(2n of .foo)
li:nth-last-match(3n+1 of .bar)</pre>
</section>
</div>
-->
<!--root -->
<div class="slide normal">
<header><h1>:root</h1></header>
<section class="content">
<pre contenteditable>
:root
</pre>
<p>Selects the document root, which is <html></p>
<ul><li>Declare <em>font-size</em> on <strong>:root</strong> if using <strong>rem</strong> units</li>
<li>Style <strong>:root</strong> only if showing <strong><head></strong> (as in our exercise files)</li>
<li>In CSS4, define Defining Variables on root. (see <a href="https://dev.w3.org/csswg/css-variables/" target="play">Variables module</a>)</li>
</ul>
<p><small><a href="files/03_root.html" target="play">example</a></small></p>
</section>
</div>
<!-- :empty pseudo-class -->
<div class="slide normal">
<header><h1>:empty & :blank pseudo-classes </h1></header>
<section class="content">
<pre contenteditable>E<b>:empty</b></pre>
<pre contenteditable><E/>
<E></E>
<E><!-- this is a comment --></E>
<E title="this is an empty element"/></pre>
<hr/>
<p>No browser support...
<pre contenteditable>E<b>:blank</b></pre>
<pre contenteditable><E> <!-- has white space --> </E></pre><small>
:-moz-whitespace-only</small>
</section>
</div>
<!-- :not(s) -->
<div class="slide normal">
<header><h1><strong>:not</strong> - Negation pseudo-class</h1></header>
<section class="content">
<pre contenteditable>E<b contenteditable="false">:not(</b>s1<b contenteditable="false">)</b></pre>
<pre contenteditable class=" example">div<b contenteditable="false">:not(</b>.excludeMe<b contenteditable="false">)</b></span></pre>
<p>Supported everywhere since IE9</p>
</section>
</div>
<!-- :not(s1, s2) -->
<div class="slide normal">
<header><h1><strong>:not(s1, s2)</strong> </h1></header>
<section class="content">
<pre contenteditable>E<b contenteditable="false">:not(</b>s1, s2<b contenteditable="false">)</b></pre>
<pre contenteditable class=" example">div<b contenteditable="false">:not(</b>.excludeMe, .excuseYou<b contenteditable="false">)</b></span></pre>
<p><a href="https://caniuse.com/#feat=css-not-sel-list" target="play">Safari Only</a></p>
</section>
</div>
<div class="slide object">
<object data="files/06_not.html"></object>
<header><h1><strong>:not</strong> - Negation pseudo-class</h1></header>
<a href="files/06_not.html" target="play" class="objectlink">Negation Selectors</a>
</div>
<div class="slide">
<header><h1>:matches(s1, s2)</h1></header>
<section class="content">
<pre contenteditable>E:matches(s1, s2)</pre><hr/>
<pre class="example" contenteditable>li<b contenteditable="false">:matches(</b>[title]<b contenteditable="false">,</b> [role]<b contenteditable="false">) a</b> {}</pre>
<pre>li[title] a,
li[role] a {}</pre>
<hr/>
<pre class="example" contenteditable><b contenteditable="false">:matches(</b>#home, #contact<b contenteditable="false">)</b> aside :matches(a:active, a:focus){}</pre>
<pre class="example" contenteditable>#home aside a:active,
#contact aside a:active,
#home aside a:focus,
#contact aside a:focus {}</pre>
<p><a href="https://caniuse.com/#feat=css-matches-pseudo">Safari only</a></p>
</section>
</div>
<div class="slide">
<header><h1>Experimental :any</h1></header>
<section class="content">
<pre contenteditable>E:matches(s1, s2)</pre>
<pre contenteditable class="example" >:-webkit-any(article, aside) :-webkit-any(article, aside) h1,
:-moz-any(article, aside) :-moz-any(article, aside) h1 {
}</pre><pre contenteditable class="example" >
a:matches(.foo, .bar, .bam) span,
a:-webkit-any(.foo, .bar, .bam) span,
a:-moz-any(.foo, .bar, .bam) span {
}</pre><pre contenteditable class="example" >
nav a:not(:matches(.foo, .bar, .bam)),
nav a:not(:-webkit-any(.foo, .bar, .bam)),
nav a:not(:-moz-any(.foo, .bar, .bam)),
nav a:not(.foo, .bar, .bam) {
}
nav a:not(.foo):not(.bar).not(.bam){
}
</pre>
</section>
</div>
<!-- Reference Combinator -->
<div class="slide">
<header>
<h1>Removed from the specification</h1>
</header>
<section class="content">
<p>Reference combinator</p>
<pre><s>E /attr/ F</s></pre>
<pre><s>label /for/ input</s></pre>
</section>
</div>
<!-- Reference Combinator -->
<div class="slide">
<header>
<h1>Parent Selector</h1>
</header>
<p>Parent selector</p>
<pre><s>E! > F</s></pre>
<pre>:has</pre>
<p>Contains a header</p>
<pre>header:has(h1, h2, h3, h4, h5, h6)</pre>
<p>Contains no headers</p>