Is Positioning With Css Supposed To Have Px

CSS Programming

When it comes to positioning elements on a webpage, CSS provides several methods to achieve the desired layout. One common question that arises is whether positioning in CSS should always be specified in pixels (px) or if other units can be used. In this article, I will delve into the topic of positioning with CSS and shed light on the use of pixels and other units.

As a web developer, I have encountered this question multiple times throughout my career. The short answer is that positioning in CSS does not have to be limited to pixels, but using pixels is often the most reliable and consistent approach. Let’s explore why.

When we position elements on a webpage, we typically use CSS properties such as position: relative, position: absolute, or position: fixed. These properties allow us to control the exact placement of elements in relation to their parent or the viewport.

By default, CSS measurements are specified in pixels. The pixel unit represents a single dot on a computer screen and provides a precise way to define the size and position of elements. When using pixels for positioning, we can be confident that the elements will be displayed consistently across different devices and browsers.

However, it’s important to note that CSS also supports other units for positioning, such as percentages (%), ems (em), and rems (rem). These units are relative to other factors, such as the size of the parent element or the font size of the document.

Using relative units for positioning can offer flexibility, especially when creating responsive designs or when the size of the elements may change dynamically. For example, using percentages can ensure that an element always takes up a certain percentage of its parent’s width or height, regardless of the screen size.

On the other hand, using relative units for precise positioning can sometimes lead to unexpected results. The size and position of elements can vary depending on the context in which they are rendered. Furthermore, different browsers may interpret relative units differently, leading to inconsistent layouts.

For this reason, when it comes to positioning elements that require precise alignment or adherence to specific dimensions, using pixels is often the safest bet. It provides a consistent and predictable result across different browsers and devices.

Ultimately, the choice of whether to use pixels or other units for positioning with CSS depends on the specific needs and requirements of the project. As a web developer, I have found that a combination of both can be beneficial. I often use pixels for precise positioning and relative units for more flexible and responsive designs.

In conclusion, while CSS allows for the use of various units for positioning, pixels remain a reliable choice for achieving consistent and predictable layouts. By understanding the strengths and limitations of each unit, web developers can make informed decisions to create visually appealing and functional webpages.


In this article, we explored the topic of positioning with CSS and whether it is necessary to use pixels for accurate layout. We learned that while CSS supports other units for positioning, pixels are often the most reliable choice. They provide consistent results across different devices and browsers. However, using relative units can offer flexibility, especially for responsive designs. As a web developer, it’s important to consider the specific needs of each project and choose the appropriate unit for positioning elements on a webpage.