Copyright Goodheart-Willcox Co., Inc. 546 Unit 3 Living Online Validation HTML is a very forgiving language. Errors are not reported nor do they cause a web page not to load. If an error exists in the code, the browser ignores it and tries its best to display the remainder of the page. To keep the quality of web pages high and to confi rm that a page is built according to the standards, a validation should be performed on a web page. Validation is a process of checking the code to ensure it contains no errors of syntax or usage. The W3C validation site (validator.w3.org) can be used to check for valid code. Visit this site and submit a web address or a fi le or directly enter code to check for errors. Just for fun, examine the W3 Schools site for conformance to standards, as shown in Figure 13-23. The site passes, but two warnings are issued. Programming Languages In order to add interactivity to a web page, more than HTML is required. There are several technologies used in web page development to produce interactivity. These include JavaScript, PHP, and other preprocessors. FYI FYI Together HTML, CSS, and validation promote sites that adhere to W3C standards. Goodheart-Willcox Publisher Figure 13-23. The W3C validation site can be used to check for valid code. The evaluation shown here reports two errors. Two errors are reported