Summary

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HTML elements are used t XX o describe the structure of the page (e.g. headings, subheadings, paragraphs).
They also provide semantic information (e.g. where emphasis should be placed, the definition of any acronyms used, when given text is a quotation).

There are properties to control t XX he choice of font, size, weight, style, and spacing.
There is a limited choice of fonts that you can assume most people will have installed.
If you want to use a wider range of typefaces there are several options, but you need to have the right license to use them.
You can control the space between lines of text, individual letters, and words. Text can also be aligned to the left, right, center, or justified. It can also be indented.
You can use pseudo-classes to change the style of an element when a user hovers over or clicks on text, or when they have visited a link.

A script is made up of a series of statements. Each statement is like a step in a recipe.
Scripts contain very precise instructions. For example, you might specify that a value must be remembered before creating a calculation using that value.
Variables are used to temporarily store pieces of information used in the script.
Arrays are special types of variables that store more than one piece of related information.
JavaScript distinguishes between numbers (0-9), strings (text), and Boolean values (true or false).
Expressions evaluate into a single value.
Expressions rely on operators to calculate a value.

Conditional statements allow your code to make decisions about what to do next.
Comparison operators (===, ! ==, ==, ! =, <, >, <=, =>) are used to compare two operands.
Logical operators allow you to combine more than one set of comparison operators.
if … else statements allow you to run one set of code if a condition is true, and another if it is false. switch statements allow you to compare a value against possible outcomes (and also provides a default option if none match).
Data types can be coerced from one type to another.
All values evaluate to either truthy or falsy.
There are three types of loop: for, while, and do … while. Each repeats a set of statements.