Web Programming with html5, css, and JavaScript

FIGURE 1.9 W3C’s htML validation service

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Web Programming with HTML5, CSS, and JavaScript

FIGURE 1.9
W3C’s htML validation service
Click this tab to check a web
page file on a local computer.
Click here to show options
such as displaying source code.
21
1.14 How to Check Your HTML Code

it. Click the
More Options
box. From the generated options, click the
Show Source
box. By
turning the show source option on, the file’s source code will display with line numbers, which
can make debugging easier. Now you’re ready to let the validation service do its magic. Click the
Check
button.
The validation service looks for invalid syntax and if it finds any, it prints an error message(s).
Here are the error messages the validation service generates for
weatherCheck.html
:
Line 20, Column 7: End of file seen when expecting text or an end
tag.

Line 5, Column 9: Unclosed element title.
K.C. Weather<title> Unfortunately, error messages can be cryptic, and that is the case for the first of the two error messages. It complains about seeing the end of the file when it’s expecting an end tag. Can you figure out what that means? What end tag might be hidden to the validation service? Please do not continue to the next paragraph until after you examine Figure 1.10’s code for an end tag problem. The web page is supposed to display a paragraph first and then a div container. To do that, you need start and end tags for a p container and then start and end tags for a div container. Unfortunately, Figure 1.10’s p and div containers overlap. Specifically, p ’s end tag comes after div ’s start tag. That prevents the HTML validation service from seeing p ’s end tag, which explains the “expecting an end tag” error message. The second error message, “unclosed element title,” is easier to figure out. The title ele- ment is a container; as such, it needs a start tag and an end tag. Unfortunately, the web page uses

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