CSS, CSS Selectors, CSS Box Model
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The document discusses CSS selectors and the CSS box model. It defines tag, class, ID and compound selectors and provides examples of how each is used. It also explains that the CSS box model accounts for the content area width plus padding, border and margin widths to determine the total box width. An example shows how to calculate the content area width if the total box width is known.
CSS, CSS Selectors, CSS Box Model
- 1. CSS Selectors CSS Box Model
- 2. CSS Selectors Tag, Class, ID, Compound Use CSS Selectors to define properties for the structure and presentation of your site. This is the key to defining specific properties for specific parts of your design.
- 3. CSS Selectors Tag : properties defined for an HTML tag. Class : properties defined for an HTML tag using a class or a <span> tag. ID : properties defined for an element or div using an id . Compound : properties defined using multiple selector types .
- 4. CSS Selectors body {margin: 10px 0;} Selector Property Value Declaration
- 5. CSS Selectors body {margin: 10px 0;} Tag* : properties defined for an HTML tag. (*Also referred to as Type, Element)
- 6. CSS Selectors body {margin: 10px 0;} <body> Everything within the body will start out with this property. </body> Tag
- 7. CSS Selectors .red {margin: 15px; color: red;} Class : properties defined for an HTML tag using a class or a <span> tag.
- 8. CSS Selectors .red {margin: 15px; color: red;} <p class= ” red ” >This is a paragraph of text in red.</p> These are <span class= ” red ” >words in red.</span> Class
- 9. CSS Selectors #wrapper {margin :0 auto;} ID : properties defined for an element or div using an id.
- 10. CSS Selectors #wrapper {margin :0 auto;} <div id= ” wrapper ” ></div> ID
- 11. CSS Selectors #content p {margin :0;} Compound : properties defined using multiple selector types.
- 12. CSS Selectors #content p {margin :0;} <div id= ” content ” > <p>This is a paragraph of text in the content div.</p> </div> Compound
- 13. CSS Box Model How do you position content? You position content in your page by using a combination of margins, padding and floats. But, in order to get your positioning and layout correct, you must know how the CSS Box Model works.
- 14. CSS Box Model content
- 15. CSS Box Model 40 px 10 px 100 px 450 px content
- 16. CSS Box Model 10 px 1 px 50 px ??? px 500 px content
- 17. CSS Box Model total box width = content area width + left padding + right padding + left border + right border + left margin + right margin
- 18. CSS Box Model #content {width: 200px;border: 1px solid #900;padding: 10px;margin: 0;background: #fee;} What is the total box width?
- 19. CSS Box Model #content {width: ???px;border: 1px solid #000;padding: 20px;margin: 10;} If the total box width is 400px, what is the width of the content area?