HTML
Chapter 02
- Taxt
When creating a web page, you add tags (known as markup) to the contents of the page. These tags provide extra meaning and allow browsers to show users the appropriate structure for the page.
We’ve tow type of tag ( markup ):
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Structural markup :
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Semantic markup :
HTML elements are used to describe the structure of the page (e.g. headings, subheadings, paragraphs).
CSS
chapter 10
Why use External Style Sheets?
An external stylesheet is a standalone . css file that is linked from a web page. The advantage of external stylesheets is that it can be created once and the rules applied to multiple web pages. … Inline styles relate to a specific HTML tag, using a style attribute with a CSS rule to style a specific page element.
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CSS treats each HTML element as if it appears inside its own box and uses rules to indicate how that element should look.
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Rules are made up of selectors (that specify the elements the rule applies to) and declarations (that indicate what these elements should look like).
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Different types of selectors allow you to target your rules at different elements.
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Declarations are made up of two parts: the properties of the element that you want to change, and the values of those properties. For example, the font-family property sets the choice of font, and the value arial specifies Arial as the preferred typeface.
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CSS rules usually appear in a separate document, although they may appear within an HTML page.
# JavaScript
A script is a series of instructions that a computer can follow one-by-one. Each individual instruction or step is known as a statement. Statements should end with a semicolon.
You should write comments to explain what your code does. They help make your code easier to read and understand. This can help you and others who read your code.
WHAT IS A VARIABLE?
A JavaScript global variable is accessible from any function. A variable i.e. declared outside the function or declared with window object is known as global variable. For example:
< script>
