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              <h1>:not Pseudo-class or Negation?</h1>

<h2>:not Pseudo-class</h2>
<p>We could see that the "Send" and "Search" buttons have been styled with a blue background except for the "Like / Heart" button - because of the <a href="https://developer.mozilla.org/en-US/docs/Web/CSS/%3Anot">:not pseudo-class</a>.</p>

<div class="message">
    <button class="message-button"><span>Send</span></button>

<div class="search">
    <button class="search-button">
        <svg class="icon icon-search"><use xlink:href="#icon-search"></use></svg>

<div class="like">
    <p>Hello, world!</p>
    <button class="like-button">
        <svg class="icon icon-heart"><use xlink:href="#icon-heart"></use></svg>

<p>The "Home" button, on the other hand, needs to be negated from the style of the generic <code>button</code> selector. We remove its blue background color and white foreground color.</p>

<div class="home">
    <p>Go home!</p>
    <button class="home-button">
        <svg class="icon icon-home"><use xlink:href="#icon-home"></use></svg>

<h1>Use Negation</h1>
<p>If you are using the object-oriented approach in structuring the CSS, you would use negation instead of :not pseudo-class. When using the :not pseudo-class, two focuses are at hand: the selector itself and the excluded selector. And the excluded selector could be easily lost within the selector itself.</p>
<p>If you really need to declare styles on a generic selector, negate the other selectors with unintended styles.</p>

<!------ SVG Icons ------>
<svg style="position: absolute; width: 0; height: 0; overflow: hidden;" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<symbol id="icon-search" viewBox="0 0 32 32">
<path d="M31.008 27.231l-7.58-6.447c-0.784-0.705-1.622-1.029-2.299-0.998 1.789-2.096 2.87-4.815 2.87-7.787 0-6.627-5.373-12-12-12s-12 5.373-12 12 5.373 12 12 12c2.972 0 5.691-1.081 7.787-2.87-0.031 0.677 0.293 1.515 0.998 2.299l6.447 7.58c1.104 1.226 2.907 1.33 4.007 0.23s0.997-2.903-0.23-4.007zM12 20c-4.418 0-8-3.582-8-8s3.582-8 8-8 8 3.582 8 8-3.582 8-8 8z"></path>
    <symbol id="icon-heart" viewBox="0 0 32 32">
<path d="M23.6 2c-3.363 0-6.258 2.736-7.599 5.594-1.342-2.858-4.237-5.594-7.601-5.594-4.637 0-8.4 3.764-8.4 8.401 0 9.433 9.516 11.906 16.001 21.232 6.13-9.268 15.999-12.1 15.999-21.232 0-4.637-3.763-8.401-8.4-8.401z"></path>
    <symbol id="icon-home" viewBox="0 0 32 32">
<path d="M32 18.451l-16-12.42-16 12.42v-5.064l16-12.42 16 12.42zM28 18v12h-8v-8h-8v8h-8v-12l12-9z"></path>
              /* ------ Using :not ------ */
button:not( .like-button )
    /* Reset */
    margin: 0;
    padding: 0;
    border: 0;
    background-color: transparent;

    /* Style */
    padding: .75em 1.25em;
    background-color: blue;
    color: white;

/* ------ Using negation ------ */
.home button
    padding: 0;
    background-color: transparent;
    color: gray;

/* ------ Ignore these styles ------ */

    display: block;

    padding: 1em;

/* Space correction */
    margin-bottom: -5px;

.search .icon,
.like .icon,
.home .icon
    width: 1.5em;
    height: 1.5em;

/* icomoon.io */
.icon {
    display: inline-block;
    width: 1em;
    height: 1em;
    stroke-width: 0;
    stroke: currentColor;
    fill: currentColor;


.search button span,
.like button span,
.home button span
    display: none;

    font-family: sans-serif;
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