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HTML & CSS IntroductionChapter 8. CSS Basics

Inheritance

Inheritance

How CSS Inheritance Works

Some CSS properties set for a parent element are inherited by its child and descendant elements. For example, when blue is set in the color property of the body element, the font color in the entire document becomes blue. This is because the color property value set for the body element is inherited by its child and descendent element. In other words, the style cascades. The name of CSS (Cascading Style Sheet) derives from this feature. Because of this feature, you don't need to set the color property for each element.

Not all properties are inherited by default. For example, border-related properties are not inherited by default. This makes sense because if you set a solid borderline in the body element and the property is inherited by all elements, the website will overcrowded with many borderlines.

Properties inherited by default

Font-related properties tend to be inherited. Here are examples of properties inherited by default.

  • color
  • font-family
  • font-weight
  • font-style
  • line-height
  • letter-spacing
  • text-align

The font-size property is inherited, but it can be overwritten for some elements such as headings.

Properties not inherited by default

Sizing, spacing, border, background, and layout-related properties are usually not inherited. Here are examples of properties not inherited by default.

  • height
  • width
  • margin
  • padding
  • border-box
  • background properties
  • border properties

IdeaInherit keyword for a property value

Even if a property is not inherited, you can make a parent element's property value inherited as a child element's property value. You can use inherit as a keyword of the property value at the child element level.

For example, if you set inherit for the border property in each element, the blue borders will apply to each element.

CSS
<section style="border: solid blue">
  <div style="border: inherit">
    <h1 style="border: inherit">Hello, World!</h1>
    <p style="border: inherit">Say hello.</p>
  </div>
</section>

The code above gives the image shown below in a browser. As you can see, if the border properties are inherited by default, there will be too many lines by default.

Inheritance


You can also learn this topic offline. Click AmazonKindle.

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Tags:

Inheritance

Cascading

HTML & CSS Introduction
Course Content

Chapter 1. Overview of Website Development

How Websites Work?

Designing, Building and Publishing Websites

Designing Websites

Building Websites – Frontend and Backend Coding

Web App vs. Website

Frontend Coding

Web Framework and CMS

Publishing Websites (Hosting Services)

Chapter 2. Preparing for Website Coding

Two Key Tools to Start Coding Websites

How Browsers Display Web Pages

File Name Rules

Website Directory Structure

Absolute Path vs. Relative Path

Chapter 3. HTML Basics

What Is HTML?

HTML Element

Attribute

HTML Document Structure

Layout Semantics

Heading and Paragraph Tag

Text-Level Semantics

Space, Line-break and Tag in Content

Comments in HTML Document

Chapter 4. HTML: Add Links and Images

Overview of Adding Links and Images

Embed Images – <img>

Image File Format

Add Hyperlinks – <a>

Add Hyperlinks to Images

Add Hyperlinks to Specific Location on Web Page

Link Tag – <link>

Script Tag – <script>

Chapter 5. HTML: Create Lists and Tables

Create Lists

Create Tables

Combine Table Cells

Chapter 6. HTML: Create Forms

Create Forms

Create Text Input Forms and Submit Button

Radio Button and Checkbox

Select Box

Labels

Auto Complete and Disabled

Chapter 7. Bridging HTML and CSS

Block Element vs. Inline Element

Nesting Elements – Parent Elements and Child Elements

Div vs. Span

Global Attribute – Class, ID and Style

Accordion – <Details> and <Summary>

Chapter 8. CSS Basics

What Is CSS?

CSS Syntax

Where To Type CSS?

CSS Basic Selectors

Descendant Selector

Inheritance

Specificity

Reset CSS

Browser Developer Tools for CSS

Comments in CSS Document

Chapter 9. Web Design Basics

Design Element Representation in HTML and CSS

Key Design Points by CSS

Length

Color Code – HEX and RGB

Color Theme

Chapter 10. CSS: Sizing and Spacing

CSS Box Model

width and height

padding

margin

Margin and Padding for Specific Side

margin: auto

box-sizing

Chapter 11. CSS: Styling Text and Images

Text Styling Properties

font-size

color

font-family

Web Font and Google Font

font-weight and font-style

text-decoration

line-height and letter-spacing

text-align

vertical-align

Styling Images

float: left and right

Chapter 12. CSS: Styling Backgrounds

background-color

background-image

background-size

background-repeat

background-position

background-attachment

background (Multiple Properties)

Chapter 13. CSS: Styling Borders and Drawing Lines

border-style

border-color

border-width

border-radius

Border (Multiple Properties)

Borders on Specific Side

Border Radius on Specific Side

Chapter 14. CSS: Layout – Key Concepts and Display Property

Layout Before and After

Layout Key Design Points

Display Property

inline, block and inline-block

display: none

Chapter 15. CSS: Layout – Flex Box

Flex Box – display: flex

flex-direction

Main Axis and Cross Axis

flex-wrap

justify-content

align-items

align-content

align-self

flex-grow

flex-shrink

flex-basis

margin: auto with Flex Box

Inline Flex Box

Nested Flex Box

Chapter 16. CSS: Styling Lists

List Styling Properties

list-style-type

list-style-image

list-style-position

Chapter 17. Creating and Styling Components

Components and Layout

Buttons

Cards

Top Bar

Footer and Bottom Bar

Chapter 18. Completing Website Development

Website Structure Design

Live Server

Home (Landing) Page Development

Main (List) Page Development

Content (Detail) Page Development

Chapter 19. Publishing Websites

Key Steps to Publish Websites

Domain and DNS Server

Favicon

GitHub Pages

Chapter 20. Supplemental Topics

Horizontal Rule – <hr>

Line Break – <br>

Reserved Characters and HTML Entities

Non-breaking Space – &nbsp;

Chapter 1. Overview of Website Development

How Websites Work?

Designing, Building and Publishing Websites

Designing Websites

Building Websites – Frontend and Backend Coding

Web App vs. Website

Frontend Coding

Web Framework and CMS

Publishing Websites (Hosting Services)

Chapter 2. Preparing for Website Coding

Two Key Tools to Start Coding Websites

How Browsers Display Web Pages

File Name Rules

Website Directory Structure

Absolute Path vs. Relative Path

Chapter 3. HTML Basics

What Is HTML?

HTML Element

Attribute

HTML Document Structure

Layout Semantics

Heading and Paragraph Tag

Text-Level Semantics

Space, Line-break and Tag in Content

Comments in HTML Document

Chapter 4. HTML: Add Links and Images

Overview of Adding Links and Images

Embed Images – <img>

Image File Format

Add Hyperlinks – <a>

Add Hyperlinks to Images

Add Hyperlinks to Specific Location on Web Page

Link Tag – <link>

Script Tag – <script>

Chapter 5. HTML: Create Lists and Tables

Create Lists

Create Tables

Combine Table Cells

Chapter 6. HTML: Create Forms

Create Forms

Create Text Input Forms and Submit Button

Radio Button and Checkbox

Select Box

Labels

Auto Complete and Disabled

Chapter 7. Bridging HTML and CSS

Block Element vs. Inline Element

Nesting Elements – Parent Elements and Child Elements

Div vs. Span

Global Attribute – Class, ID and Style

Accordion – <Details> and <Summary>

Chapter 8. CSS Basics

What Is CSS?

CSS Syntax

Where To Type CSS?

CSS Basic Selectors

Descendant Selector

Inheritance

Specificity

Reset CSS

Browser Developer Tools for CSS

Comments in CSS Document

Chapter 9. Web Design Basics

Design Element Representation in HTML and CSS

Key Design Points by CSS

Length

Color Code – HEX and RGB

Color Theme

Chapter 10. CSS: Sizing and Spacing

CSS Box Model

width and height

padding

margin

Margin and Padding for Specific Side

margin: auto

box-sizing

Chapter 11. CSS: Styling Text and Images

Text Styling Properties

font-size

color

font-family

Web Font and Google Font

font-weight and font-style

text-decoration

line-height and letter-spacing

text-align

vertical-align

Styling Images

float: left and right

Chapter 12. CSS: Styling Backgrounds

background-color

background-image

background-size

background-repeat

background-position

background-attachment

background (Multiple Properties)

Chapter 13. CSS: Styling Borders and Drawing Lines

border-style

border-color

border-width

border-radius

Border (Multiple Properties)

Borders on Specific Side

Border Radius on Specific Side

Chapter 14. CSS: Layout – Key Concepts and Display Property

Layout Before and After

Layout Key Design Points

Display Property

inline, block and inline-block

display: none

Chapter 15. CSS: Layout – Flex Box

Flex Box – display: flex

flex-direction

Main Axis and Cross Axis

flex-wrap

justify-content

align-items

align-content

align-self

flex-grow

flex-shrink

flex-basis

margin: auto with Flex Box

Inline Flex Box

Nested Flex Box

Chapter 16. CSS: Styling Lists

List Styling Properties

list-style-type

list-style-image

list-style-position

Chapter 17. Creating and Styling Components

Components and Layout

Buttons

Cards

Top Bar

Footer and Bottom Bar

Chapter 18. Completing Website Development

Website Structure Design

Live Server

Home (Landing) Page Development

Main (List) Page Development

Content (Detail) Page Development

Chapter 19. Publishing Websites

Key Steps to Publish Websites

Domain and DNS Server

Favicon

GitHub Pages

Chapter 20. Supplemental Topics

Horizontal Rule – <hr>

Line Break – <br>

Reserved Characters and HTML Entities

Non-breaking Space – &nbsp;