Section 7

AWESOMee·2022년 3월 28일

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Udemy Web Developer Bootcamp Section 7

CSS

CSS: Id and Class

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS Selectors</title>

    <link rel="stylesheet" href="app.css">
    <link rel="stylesheet" href="more_styles.css">
</head>


<body>
    <nav>
        <label for="search">Search</label>
        <input type="text" placeholder="search" id="search">
        <input type="password" placeholder="password">
        <button>Log In</button>
        <button id="signup">Sign Up</button>
    </nav>
    <main>
        <h1>Popular Posts</h1>
        <section class="post">
            <span>Posted by <a href="#213adas">/u/not_funny</a></span>
            <h2>Lol look at this hilarious meme <span class="tag">funny</span></h2>
            <button>+Vote</button>
            <hr>
        </section>
        <section class="post">
            <span>Posted by <a href="#345adas">/u/gooner4lyfe</a></span>
            <h2>Happy birthday to the strongest defender/bodyguard in the Prem! <span class="tag">gunners</span></h2>
            <button>+Vote</button>
            <hr>
        </section>
        <section class="post">
            <span>Posted by <a href="#981adas">/u/dogfan</a></span>
            <h2>This Corgi got some good stuff from the vet. <span class="tag">dogs</span></h2>
            <button>+Vote</button>
            <hr>
        </section>
    </main>
    <footer>
        <nav>
            <ul>
                <li>
                    <a href="#home">Home</a>
                </li>
                <li>
                    <a href="#about">About</a>
                </li>
                <li>
                    <a href="#contact">Contact</a>
                </li>
                <li>
                    <a href="www.google.com">Google</a>
                </li>
            </ul>
        </nav>
        <a href="#license">Content is available under these licenses.</a>
    </footer>

</body>

</html>

/* * {
    color: pink;
    background-color: cyan;
} */

body {
    background-color: #f1faee;
}

button {
    font-size: 30px;
    background-color: #a8dadc;
}

h1,h2 {
    color: #1d3557;
}

#signup {
    background-color: #1d3557;
    color: #f1faee;
}

span {
    color: #457b9d;
}

.tag {
    background-color: #e63946;
    color: #f1faee;
    font-size: 16px;
}

Selectors

The Descendant Selectors
Select all <a>'s that are nested inside an <li>
```
li a {
    color: teal;
}
```
The Adjancent Selectors
Select only the paragraghs that are immediately preceded by an <h1>
```
h1 + p {
    color: red;
}
```
Direct-Descendant Selectors
Select only the <li>'s that are direct children of a <div> element
```
div > li {
    color: white;
}
```
Attribute Selector
Select all input elements where the type attribute is set to "text"
```
input[type="text"] {
    width: 300px;
    color: yellow;
}
```

.post a {
    color: #457b9d;
}

footer a {
    color: #e63946;
}

/* input + button {
    background-color: pink;
} */

h2 + button {
    font-size: 20px;
    /* background-color: magenta; */
}

footer > a {
    color: #457b9d;
}

input[type="password"] {
    color: greenyellow;
}

a[href*="google"] {
    color: magenta;
}

Pseudo Classes

Keyword added to a selector that specifies a special state of the selected element(s)

:active
:checked
:first
:first-child
:hover
:not()
:nth-child
:nth-of-type

.post button:hover {
    background-color: #e63946;
    color: #f1faee;
}

.post a:hover {
    text-decoration: underline;
}

.post button:active {
    background-color: green;
}

.post:nth-of-type(2) {
    background-color: aquamarine;
}

Pseudo Elements

Keyword added to a selector that lets you style a particular part of selected element(s)

::after
::before
::first-letter
::first-line
::selection

h2::first-letter {
    font-size: 50px;
}

p::first-line {
    color: purple;
}

p::selection {
    background-color: orange;
}

Specificity

Specificity is how the browser decides which rules to apply when multiple rules could apply to the same element.

It is a measure of how specific a given selector is. The more specific selector "wins"

ID > CLASS > ELEMENT

!important exception

The important rule is something that we can use on individual style declarations. It is generally something you should not use.

button {
    background-color: magenta !important;
}

CSS Inhertitance

body {
    color: purple;
}

section {
    color: aqua;
}

form {
    color: greenyellow;
}

body {
    color: purple;
}

section {
    color: aqua;
}

form {
    color: greenyellow;
}

button, input {
    color: inherit;
}

body {
    color: purple;
}

section {
    color: aqua;
}

button, input {
    color: inherit;
}

body {
    color: purple;
}

button, input {
    color: inherit;
}

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