Is HTML Case Sensitive Language?

Introduction

All versions of HTML including HTML5 are case insensitive except XHTML.

HTML, being case-insensitive language, means whether you write a tag or an attribute in lowercase letters or uppercase letters or both, it will be treated as the same. We can also mix the cases in a single tag or attribute name as well. But as already discussed above, XHTML is case sensitive, and the important thing to remember is that XHTML has a strict rule for writing all elements in lowercase letters.

Example All the following ways to print the same text using HTML code are correct and bug-free, irrespective of the fact whether lowercase or uppercase or some random hybrid case is used.

Note:

• During the parsing process of the HTML, all tags and attributes are converted to lowercase.
• Another important point to note is that although attribute names are not case-sensitive in HTML, the values provided by you are considered case-sensitive.

Is HTML 5 Case Sensitive?

HTML 5, the latest version of HTML is also case insensitive. HTML5 is the new web standard. It was made to bring flexibility and to address all the new technologies and the latest multimedia that is being viewed in browsers through mobile phones, cars, televisions, etc.

Note:

Although there is no hard-bound rule for people to write HTML tags and attributes in either lowercase or uppercase, or any case for that matter, in general, most web designers in the world follow the practice of writing lowercase letters in HTML tags and attributes. Due to this, it has become a worldwide accepted standard among designers to use lowercase letters in HTML.

Does Capitalization matter in HTML? (explain with an example)

A simple answer to the question is "NO", and capitalization does not matter in HTML. After parsing, any type of casing where lowercase or uppercase or camel case or kebab case, etc., are the same.

Best Practices for Letter Casing

A few best practices for letter casing are:

• Following a Single Case can save you time: If you have started using a particular case, say lowercase, then keep using that only everywhere. It will save you time while writing it, as you do not need to worry about using the Caps Lock key or some other shortcut keys for turning the upper case on and off.
• Following a single casing strategy makes your code look consistent and easy to read: For example, following the below kind of strategy is not a good practice:

• When you are working in an organization or with some community, try following the same trend which is being followed by all your co-workers so that it is easy for each one of them to understand and modify it.

Learn More

To learn more about HTML, please visit the following article link