Angular Interview Practice

Are all attributes reflected as DOM properties?

1. Yes, all attributes are reflected

2. No, some attributes like data-* are accessible via dataset

3. Only standard attributes are reflected

4. Only boolean attributes are reflected

The correct answer is: No, some attributes like data-* are accessible via dataset

In the context of web development and Angular specifically, not all attributes on a DOM element are reflected as properties. Some attributes, especially those prefixed with "data-" (such as data-*), do not have a corresponding property in the DOM object model. HTML5 introduced the data-* attributes to facilitate embedding custom data attributes on standard HTML elements. These attributes can be accessed programmatically using the `dataset` property of the corresponding DOM element. For example, if you have an element like `<div data-info="example"></div>`, you can access the value "example" using `element.dataset.info` in JavaScript. The correct answer highlights the fact that while many attributes have a direct relationship with the DOM properties, this is not universally true, particularly for the data-* attributes, which serve a unique purpose in storing custom data that doesn't have a standard property on the element. Moreover, the other options present misconceptions. Asserting that all attributes are reflected overlooks the nuances of the DOM and data-* usage. Suggesting only standard attributes are reflected implies a narrower view than is accurate, ignoring the existence of attributes designed specifically for data storage. Finally, saying only boolean attributes are reflected does not encompass the broader range of attributes and is misleading.