XHTML
XHTML (Extensible Hypertext Markup Language) is a variant of HTML (Hypertext Markup Language) that adheres to the rules of XML (Extensible Markup Language). XHTML was developed to combine the flexibility and strictness of XML with the functionality of HTML, making it known as a stricter, well-formed version of HTML.
A central aspect of XHTML is adherence to XML syntax rules. This means that all XHTML documents must be well-formed, which includes the following requirements:
- All tags must be closed.
- All elements must be correctly nested; a tag must be closed within the same tag in which it was opened.
- All attribute values must be enclosed in quotes.
Another important aspect of XHTML is its strict structure and validation. Since XHTML is based on XML, XHTML documents can be checked and validated by XML parsers, increasing the consistency and accuracy of the documents.
XHTML offers compatibility and interoperability with various devices and platforms. The strict syntax rules ensure that XHTML documents can be correctly rendered across different browsers, mobile devices, and other user agents. This makes XHTML particularly suitable for applications that require high compatibility and consistent presentation.
In summary, XHTML is a variant of HTML that adopts the strict syntax rules of XML to create well-formed and valid documents. By adhering to these rules, XHTML offers better compatibility and interoperability with various devices and platforms, making it a reliable choice for web developers aiming to create consistent and cross-platform websites.