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

Revision as of 17:10, 2 January 2024

⭑HTML⭑

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

Html 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

After the 1st word and after the 2nd word (with no spaces in between words and entity references)

⊹Option + Command + I --- Google Chrome

⭑CSS⭑

⊹Syntax simple CSS selectors

Element
class (define with .)
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

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

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

⊹Conflict Resolution

Origin precedence: Last declaration wins
Inheritance: DOM Tree
Specificity: Most specific selector combination wins

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

⊹Styling Text

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

CSS Fonts

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:

Top and bottom margins of elements are sometimes collapsed into a single margin that is equal to the largest of the two margins.

This does not happen on left and right margins! Only top and bottom margins!

@@ Line 99: / Line 99: @@
    box-sizing: border-box;
   }
+'''''The * selector selects all elements.'''''
+The * selector can also select all elements inside another element.
 ⊹Margin Collapse: