Latest revision as of 20:03, 11 May 2024

⭑HTML⭑

⊹A Simple HTML structure:

<body> = contains all elements that are visible

<head> = all the elements that are not visible on the page ex. <title> <style>

⊹General Technique: 1. Create element with HTML 2. Style with CSS one-by-one

⊹Well chosen content of H1 element is crucial to SEO.

⊹Only for links: <a href="https://www.w3schools.com" target="_blank">Visit Me!</a>

The target attribute specifies where to open the linked document.

Syntax: <a target="_blank|_self|_parent|_top|framename">

Entities

Help avoid rendering issues
Safeguard against more limited character encoding
Provide characters not available on a keyboard

Instead of	<	>	&
Use:	&lt ;	&gt ;	&amp ;

Use nbsp; HTML document ALWAYS appear together on 1 line

⊹Option + Command + I --- Google Chrome

Class

The class attribute can be used on any HTML element.

The HTML class attribute specifies one or more class names for an element.

Different HTML elements can point to the same class name.

JavaScript can access elements with a specific class name with the getElementsByClassName() method

Elements

Text elements

⊹ <p> by default, come with margin at the top and bottom. So, {margin-top:0px; margin-bottom:0px; }

<strong> </strong> --- bold

<u> </u> --- underline

<span class="span-example" > </span> --- modify a specific part of the text without affecting the whole thing

.span-example {
  color: red
  margin-left: 12px; ---set a white space for text
}

.span-example:hover {
  text-decoration: underline;
}

<div>

division --- just a box, is a block element, it can contain other elements (like a container)

Ex.

<div class="video-preview">

.video-preview {
  width:300px;
  display: inline-block;
  vertical-aligh: top;
  margin-right: 15px;
}

<pre>

Text in a <pre> element is displayed in a fixed-width font, and the text preserves both spaces and line breaks. Really useful with ASCII-Art.

⊹<pre> elements with the default values:

pre {
 display: block;
 font-family: monospace;
 white-space: pre;
 margin: 1em 0;
}

<buttom>

Ex.

.button1 {
 background-color: blue;
 color: white;
 border: none;
 border-radius:18px;
 text-align: center;
 text-decoration: none;
 display: inline-block;
 font-weigh: bold;
 font-size: 16px;
 margin: 4px 2px;
 padding-bottom: 10px;
 vertical-align: top;
 transition-duration: 0.4s;
 cursor: pointer;
}

html: <button class="button button1">White</button>

{border-radius: 2px;} - rounded corner (ex. button )

{transition: background-color 1s, color 1s;}

{box-shadow:  5px(horizontal) 5px(vertical) 10px(blur) rgba(0, 0, 0, 0.6);}

"a" —> opacity, how see through this color is

Image and Text box

<img src="/images/html5.gif" alt="HTML5 Icon">

src - Specifies the path to the image

alt - Specifies an alternate text for the image

{
  width: 300px;
  height: 300px;
  object-fit: cover;
  object-position: contain;
  border-width: right;
  border-style: solid;
  border-color: red;
}

Text box:

<input class="search-bar" type="text" placeholder="Search">

.search-bar {
  font-size: 20px;
  margin-left: 12px;
}

Nested Layouts Technique

vertical layout

horizontal layout

use <div> to separate layouts. Create horizontal layouts with also display: inline-block.

Responsive design

Media query:

@media (max-width: 500px){

}

⭑CSS⭑

<link rel="stylesheet" href="style.css">

rel = relation

⊹Syntax simple CSS selectors

Element
class (define with .) -target
id (define with #)

⊹Combining Selectors:

Element with class selectors (selector.class)
Child (direct) selector (selector > selector)
Descendant selector (selector selector)

-Didn't cover:

Adjacent sibling selector (selector + selector)
General sibling selector (selector ~ selector)

⊹Pseudo-Class Selector (adds extra styles in a certain situation)

: link
: visited
: hover
: active
: nth-child

Ex.

.subscribe-button:hover {
Background-color: blue ;
opacity: 0.3 -> to fade out an element, 0 (transparent)
}

.subscribe-button:active {
Background-color: green;
}

{
trasition: opacity 1s;
}

⊹Conflict Resolution

Origin precedence: Last declaration wins
Inheritance: DOM Tree
Specificity: Most specific selector combination wins (has higher priority!)

(Score) 1. Style="..." 2. ID 3. Class, pseudo-class, attribute 4. # of Elements

Class name selector > Element name selector

Text Styles

.style {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 24px;
  font-weight: bold;
  font-style: italic;
  text-align: center;
  color: #0000ff;
  line-height: 24px;
}

CSS Fonts

⭑Google Fonts put links into <head>, then change the font-family in CSS

Set Font Size With Em:

To allow users to resize the text (in the browser menu), many developers use em instead of pixels.

1em is equal to the current font size. The default text size in browsers is 16px. So, the default size of 1em is 16px.

The size can be calculated from pixels to em using this formula: pixels/16=em

The Box Model

⊹The box-sizing property allows us to include the padding and border in an element's total width and height.

If you set box-sizing: border-box; on an element, padding and border are included in the width and height

* {
 box-sizing: border-box;
}

The * selector selects all elements.

The * selector can also select all elements inside another element.

Margin Collapse

Vertical(Top and bottom) margins that touch collapse and the larger one wins.

Horizontal margins combine together.

Margins don't define the width of the box. Just define how far other elements should be pushed away from it.

Space (around an element) = margin, Space (inside of an element) = Padding

⊹The float property is used for positioning and formatting content e.g. let an image float left to the text in a container.

float: left|right|none|inherit;

<style>
img {
 float: right;
}
</style>

Float don't have vertical margin collapse

⊹The clear property controls the flow next to floated elements.

Specifies what should happen with the element that is next to a floating element.

clear: none|left|right|both|initial|inherit;

img {
 float: left;
}
p.clear {
 clear: left;
}

Display Property

1. block element: entire line

2. inline-block element: only takes up as much space as it needs to

3. inline element: within a line of text

Ex.

.video-author,
.video-stats {
  display: inline-block; --- can change from block element to inline-block element
}

Grid

Inline styles:

<div style="background-color: lightblue;"> div1 </div">

A grid is a layout that has rows and columns. To create a grip, we need a container.

<div style=" display: grid; 
grid-template-columns: 1fr 1fr 1fr; --- fr= free space, ratio
column-gap: 20px; row-gap: 40px; --- add space between columns and rows
">

<div style="background-color: lightblue; height:200px;"> ABC </div">

The layout is more rigid in Grid than Felxbox.

Flexbox

Flexbox = flexible layout (dependent on our content size)

{display: flex;
flex-direction: row;
justify-content: space-between;
align-items: start/end/center/;
max-width: 300px;}

Nested Flexbox

.search-bar {
flex: 1;
height: 34px;
padding-left: 10px;
font-size: 16px;
border-width: 1px;
border-style: solid;
border-color: grey;
border-radius: 2px;
box-shadow: inset 1px 2px 5px rgba(0,0,0,0.05);
margin-left: -1px;
}

flex-shrink: 0; ---> Keep the width!

width: 0; ---> Shrink!

Target the placeholder on an input element: .search-bar::placeholder{}

Position

Position: Static --> by default

Position: fixed:

Top (How far away our element is from the top of the window)

Left, bottom, right --> can also be negative numbers

Height, weight --> don’t want to resize the page

Absolute: placed on the page

Relative: placed in the browser window

Z-index: 1.2.......100

⭑JAVA SCRIPT⭑

<script src="js/script.js"></script>
<script> </script>

User:Michel W/Self-learning: Difference between revisions