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In this chapter from Learn to Code HTML and CSS: Develop and Style Websites, Shay Howe discusses the box model and how it works with HTML and CSS, and also looks at a few new CSS properties.
Thomas Michaud walks you step by step through how to create a table in HTML, in this chapter from Foundations of Web Design: Introduction to HTML & CSS.
This chapter from HTML and CSS: Visual QuickStart Guide, 8th Edition explains which HTML semantics are appropriate for different types of text, especially (but not solely) for text within a sentence or phrase.
Q: Are there alternatives to Arial, Times, and Georgia for Web designers?
The short answer is YES!
The slightly longer answer is that most designers use Arial, Times, or Georgia, and, to a lesser degree, Verdana, Trebuchet MS, Courier, and Comic Sans because they think that’s all they have at their disposal, but they are wrong.
The long answer is that the core Web fonts (the one listed above plus Impact and Web Dings) are used because they are almost guaranteed to be installed on the vast majority of computers your designs are likely to be installed on. One fact of life in Web design is that unless the end user's computer has access to the font file, then the browser cannot use it.
Q: What is the practical difference between px (pixel) and em (pronounced m)? When is it best to use one over the other?
The short answer is that pixels measure dimensions relative to the screen while ems measure dimensions relative to type size.
The slightly longer answer is that pixels are the natural unit for measuring dimensions on a screen and are often used when precise design is required. Ems are the natural unit for measuring type and used when you want to allow maximum design flexibility.