Xiuxiu Wang
Answer
An HTML document basically includes to parts title and body. Usually foremost, it should be defined as a html document starting with 'html'and ends up with '/html', lowcase tags.
CSS refers to 'Cascading Style Sheets' is a style sheet language that describes the style of an HTML document; it describes how HTML components should be presented.
JavaScript is the porgramming language of HTML and the web. It is used to make webpages interactive and provide online programs.
Header:'header';
navigation bar: 'nav';
main content: 'main';
sidebar:'aside', often placed indise 'main'.
HTML elements with no content are called empty elements. Empty element needn't the end tag, like the tag 'br', which means a line break.
Element selectors are used to select HTML elements based on the element name.
Id selectors use HTML element id attributes to fulfill the select targets. It should start with a hash(#), followed by the specific id of an element. E.g.: id = 'para1'.
Class selectors select elements with specific class attributes, and it should start with a period (.) and then followed by the name of the class. E.g.: .center.
I select the element selector method to select all paragraphs first with element name equals to p, and then set the text color as green with the sentence 'color: green;', and set the font style as Arial with the sentence'font-family: Arial;'. After put them into a {}, just place all the orders into the style section which is at the beginning of the webpage design.