Angular Interview Practice

Are DOM properties treated as case-sensitive or case-insensitive?

1. Case-insensitive

2. Case-sensitive

3. Only case-sensitive in certain browsers

4. Depends on the element type

The correct answer is: Case-sensitive

In the context of the Document Object Model (DOM), properties are treated as case-sensitive. This means that when accessing or modifying properties of DOM elements using JavaScript, the specific casing used matters. For example, if you refer to a property as "innerHTML" it is distinct from "InnerHtml" or "INNERHTML." The JavaScript language and the DOM API are designed such that property names must match exactly in terms of letter casing for the intended property to be accessed or modified correctly. This case sensitivity is crucial because it ensures consistency and predictability in DOM manipulation. When working with JavaScript to interact with the DOM, developers must be precise in their syntax, and failing to adhere to the correct case can lead to runtime errors or unintended behavior, as JavaScript will not recognize incorrectly cased properties. Understanding this distinction is important for writing accurate and functional JavaScript code when dealing with web elements and their properties.