Type to generate custom UI components with AI

Type to generate UI components from text


Browse thousands of MUI, Tailwind, React components that are fully customizable and responsive.

Explore Components

CSS Font Weight: Attain Accessibility and Stunning Great Design

CSS, born out of the need for enhanced control over web page design, has become an indispensable tool for developers. It separates the structure of a webpage (HTML) from its presentation, allowing developers to define styles that govern the look and feel of a site. By doing so, CSS streamlines the development process, fosters consistency, facilitates the creation of responsive and visually captivating websites, and enables the separation of presentation and content, including layout, colors, and fonts.

Understanding and effectively using ‘font-weight’ in CSS is not just about aesthetics. It also plays a crucial role in accessibility. For instance, people with low vision conditions may have difficulty reading text set with a ‘font-weight’ value of ‘100’ (Thin/Hairline) or ‘200’ (Extra Light), especially if the font has a low contrast color ratio. Therefore, it’s essential to consider the accessibility implications when using ‘font-weight’ in CSS.

In this article, we will delve deeper into the concept of ‘font-weight’ in CSS, its values, how to use it effectively, and how it impacts the accessibility of a webpage. We will also explore best practices to ensure that the use of ‘font-weight’ enhances the user experience and maintains accessibility standards.

If you’re interested in exploring more about how ‘font-weight’ and other CSS properties can be used to create accessible and visually appealing webpages, consider visiting Purecode. We offer a wide range of AI-generated templates and components that can be customized to suit your needs. Whether you’re a seasoned developer or just starting out, Purecode can help you create stunning, accessible, and maintainable websites that delight your users.


Understanding CSS Font Weight

The ‘font-weight’ property in CSS is a powerful tool that allows developers to control the thickness or boldness of the normal characters within an HTML element. It accepts a range of values, including numeric values like 100 (thin) to 900 (extra bold), and keywords like “normal” and “bold”.

The ‘font-weight’ property sets the weight or thickness of a font and is dependent either on available font faces within a font family or weights defined by the browser. This property is used to adjust the weight or thickness of a font, with the weights available depending on the ‘font family’ that is currently set.

The ‘font-weight’ property can be expressed as either a keyword value or a predefined numeric value. The keyword value ‘normal’ maps to the numeric value 400 and the value ‘bold’ maps to 700. If a font has a bold (“700”) or normal (“400”) version as part of the font family, the browser will use that. If those are not available, the browser will mimic its own bold or normal version of the font.

How font weight affects the visual representation of text on a webpage

The impact of font weight on the visual representation of text extends beyond mere aesthetics—it significantly influences the way users perceive and interact with content.

  • Emphasis and Readability: Font weight serves as a powerful tool to emphasize key elements within a webpage. Bolder text naturally draws the eye, guiding users’ attention to important headings, subheadings, or critical information. Striking the right balance ensures that emphasis enhances, rather than overwhelms, the overall reading experience.

  • Visual Hierarchy: Through judicious use of font weight, designers establish a visual hierarchy that guides users through the content. Headings with heavier weights denote importance and hierarchy, while lighter weights convey subtlety and supplementary information. This hierarchy aids in organizing information and improving overall comprehension.

  • Branding and Consistency: Font weight is integral to maintaining brand consistency across a website. By defining a standardized font-weight for various text elements, developers ensure a cohesive and professional appearance. Consistency in font-weight contributes to a polished and recognizable brand identity.

  • Accessibility Considerations: Font weight plays a vital role in enhancing accessibility. Ensuring an appropriate contrast between text and background is crucial for users with visual impairments. By carefully selecting font weights, developers can contribute to a more inclusive design, making content legible for all users.

It’s important to note that not all fonts support every ‘font-weight’ value, so be sure to check which weights are available for your chosen font. With a solid understanding of ‘font-weight’ in CSS, you can create beautiful and practical typography for your website.

In the next section, we will delve deeper into the different values for ‘font-weight’ and how to use them effectively in CSS.

CSS Font Weight Values

The ‘font-weight’ property in CSS accepts values from 100 to 900, with 100 representing the thinnest weight and 900 representing the boldest weight. In addition to these numeric values, the ‘font-weight’ property also accepts the keyword values ‘normal’ and ‘bold’, which correspond to the numeric values 400 and 700, respectively.

Let’s delve into each value.

The font-weight property accepts:

  • 100 (Ultra-Thin): This font weight imparts an exceptionally delicate and light appearance to the text. It is ideal for creating subtle distinctions and an airy feel and is often employed for decorative or elegant typography.

  • 200 (Extra Light): Slightly bolder than 100, this value adds a touch more substance while maintaining a delicate demeanor. It’s also suitable for conveying a sense of sophistication without compromising readability.

  • 300 (Light): The light font weight strikes a balance between subtlety and legibility. It is commonly used for body text, providing a gentle emphasis without overwhelming the reader.

  • 400 (Normal/Regular): This is the standard font-weight for most text elements. It offers a neutral and balanced appearance, ensuring clarity and readability. Web browsers typically render text with a font-weight of 400 by default.

  • 500 (Medium): Stepping into the slightly bold territory, 500 is often used to add a moderate emphasis to headings or important content. It enhances visibility without being too imposing.

  • 600 (Semi-Bold): This font-weight introduces a noticeable boldness, making it suitable for headings or elements that require a stronger visual presence. It strikes a good balance between emphasis and subtlety.

  • 700 (Bold): A widely used font-weight for creating prominent headings and ensuring a strong visual hierarchy. Bold text commands attention and is effective in guiding users through content.

  • 800 (Extra-Bold): This value imparts a substantial weight to text, making it well-suited for impactful design elements. Additionally, it adds a significant emphasis without sacrificing legibility.

  • 900 (Ultra-Bold): The boldest option, 900 delivers a robust and commanding appearance. It is reserved for instances where maximum visual weight is desired, such as in logos or attention-grabbing headlines.

Examples of How Each Value Affects the Visual Representation of Text

Here’s an example of how different ‘font-weight’ values can affect the visual representation of text:

<!DOCTYPE html>
<html lang="en">
       <meta charset="UTF-8" />
       <meta name="viewport" content="width=device-width, initial-scale=1.0" />
       <link rel="stylesheet" href="style.css" />
       <title>CSS font weight</title>
       <p class="weight-100">This is 100 font weight.</p>
       <p class="weight-200">This is 200 font weight.</p>
       <p class="weight-300">This is 300 font weight.</p>
       <p class="weight-400">This is 400 font weight.</p>
       <p class="weight-500">This is 500 font weight.</p>
       <p class="weight-600">This is 600 font weight.</p>
       <p class="weight-700">This is 700 font weight.</p>
       <p class="weight-800">This is 800 font weight.</p>
       <p class="weight-900">This is 900 font weight.</p>
@import url("https://fonts.googleapis.com/css2?family=Roboto:wght@100;300;400;500;700;900&display=swap");
body {
   font-family: "Roboto", sans-serif;
p.weight-100 {
   font-weight: 100;
p.weight-200 {
   font-weight: 200;
p.weight-300 {
   font-weight: 300;
p.weight-400 {
   font-weight: 400;
p.weight-500 {
   font-weight: 500;
p.weight-600 {
   font-weight: 600;
p.weight-700 {
   font-weight: 700;
p.weight-800 {
   font-weight: 800;
p.weight-900 {
   font-weight: 900;

Here is how it looks, one relative font-weight bolder than the previous

bolder font weight normal font weight

Understanding how these values influence text allows developers to make informed decisions when styling their web content. In the subsequent sections, we’ll explore practical examples of applying these font weights to enhance both aesthetics and accessibility in web design.

Using CSS Font Weight in Practice

The ‘font-weight’ property in CSS can be applied through various methods: inline, internal, or external CSS, each offering flexibility based on the scope and structure of your project. Here are three common approaches:

Inline CSS

Inline CSS is used to apply styles directly to an HTML element. This method is useful for applying styles to a single element, but it can become cumbersome and hard to manage if used excessively. Here’s an example of how to apply ‘font-weight’ inline:

<p style="font-weight: bold;">This is a text bold paragraph.</p>

In this example, the ‘font-weight’ property is set to ‘bold’, which makes the text within the paragraph bold.

Internal CSS

Internal CSS is defined within the <style> tag in the <head> section of an HTML document. It applies to the entire HTML document. This approach is particularly useful when you want to apply the same font weight to various elements on a specific page.

Here’s an example of how to apply ‘font-weight’ internally:

<!DOCTYPE html>
   p {
     font-weight: bold;
 <p>This is a bold paragraph.</p>

In this example, the ‘font-weight’ property is set to ‘bold’ for all paragraph elements in the HTML document.

External CSS

External CSS is defined in a separate .css file and linked to the HTML document using the <link> tag. It’s the most efficient way to apply styles to a large number of elements, as it separates the style from the HTML content. This method is more organized and scalable, the external CSS files can be created and linked to multiple HTML documents promoting consistency throughout an entire website.

Here’s an example of how to apply ‘font-weight’ externally:

<!DOCTYPE html>
 <link rel="stylesheet" type="text/css" href="styles.css">
 <p>This is a bold paragraph.</p>

And the corresponding ‘styles.css‘ file:

p {
 font-weight: bold;

In this example, the ‘font-weight’ property is set to ‘bold’ for all paragraph elements in the HTML document, defined in the external ‘styles.css’ file

In all three cases, the ‘font-weight’ property can take a range of values from 100 (thin) to 900 (extra bold), as well as the keyword values ‘normal’ and ‘bold’. It’s important to note that not all fonts support every ‘font-weight’ value, so be sure to check which weights are available for your chosen font.

In the next section, we will delve deeper into the impact of ‘font-weight’ on the readability and user experience of a webpage.

Impact of Font Weight on Readability and User Experience

Font weight is a silent but powerful player in the realm of web design, exerting a substantial influence on the readability and overall user experience of a website. The strategic use of font weight goes beyond mere aesthetics; it directly shapes how users engage with content.

  1. Emphasis and Attention: Font weight serves as a visual cue, directing the user’s attention to specific elements on a page. Heading with a bold font weight naturally stands out, guiding users through the content hierarchy. However, it’s essential to strike a balance, ensuring emphasis without overwhelming the reader.

  2. Legibility and Clarity: The choice of font weight significantly impacts the legibility of text, especially in varying contexts and screen sizes. Lighter weights may enhance elegance but can become challenging to read in smaller sizes, while heavier weights may sacrifice clarity. Finding the right balance ensures that text remains readable across devices and accommodates users with different visual abilities.

  3. Visual Hierarchy and Organization: Font weight plays a pivotal role in establishing a clear visual hierarchy. By assigning different weights to headings, subheadings, and body text, designers create an organized structure that aids users in navigating content. This visual organization enhances the overall user experience, making information easily digestible.

  4. Branding and Consistency: Font weight contributes to the overall consistency and branding of a website. A standardized use of font weights fosters a cohesive look and reinforces brand identity. Consistency in font weight helps users associate a specific visual style with the brand, promoting a memorable and professional experience.

Best practices for using font-weight to improve readability and user experience

Incorporating font weight effectively requires a thoughtful approach to enhance both readability and user experience:

  • Consider Context and Purpose: Tailor font weight to the specific context and purpose of each element. Headings may benefit from a bolder weight for prominence, while body text should prioritize legibility with a moderate weight.

  • Test Across Devices and Screen Sizes: Test font weights across various devices and screen sizes to ensure optimal legibility and visual appeal. What works on a large desktop screen may need adjustments for smaller mobile screens.

  • Maintain Consistency: Establish a consistent use of font weights across the website to create a unified and professional appearance. Consistency aids in building a seamless and recognizable user experience.

  • Accessibility Considerations: Prioritize accessibility by ensuring sufficient contrast between text and background. Choose font weights that provide clarity without causing strain for users with visual impairments.

  • Use Hierarchy to Guide Users: Leverage font weight to create a visual hierarchy (how bold or how light they are in relation to their parent element) that guides users through the content. This aids in improving overall comprehension and engagement.

Remember to consider the font weight of your website’s text when choosing the font family and size to ensure the best possible user experience. Ultimately, improving the readability of your website can lead to increased engagement, better user satisfaction, and more significant business success.

In the next section, we will delve deeper into how font weight can impact accessibility, especially for users with visual impairments.

CSS Font Weight and Accessibility

In the intricate dance of web design, every stylistic decision holds profound implications for accessibility, and font-weight is no exception. For users with visual impairments, the judicious application of font-weight becomes a critical factor in determining the accessibility of digital content.

  • Contrast and Legibility: Font weight directly influences the contrast between text and its background. For users with low vision or other visual impairments, maintaining a sufficient contrast is paramount. Lighter font weights may lack the necessary differentiation, making text difficult to discern. Conversely, excessively bold weights can cause visual fatigue. Striking the right balance ensures optimal legibility for all users.

  • Screen Reader Compatibility: Screen readers, essential tools for users with visual impairments, rely on well-structured HTML to convey information. Font weight plays a role in creating a clear hierarchy that screen readers can interpret. Thoughtful use of varying weights in headings and body text enhances the overall understanding of content when read aloud.

  • Adjustability for User Preferences: Accessibility is synonymous with flexibility. Users with visual impairments often customize their digital experience, including adjusting font sizes and styles. Font weight should be selected with consideration for these adjustments, ensuring that the text remains readable and maintains its intended emphasis even when modified by user preferences.

Best practices for using font-weight to ensure accessibility

Embracing accessibility in web design involves intentional choices that prioritize inclusivity. Here are some best practices for using font-weight to enhance accessibility:

  • Optimal Contrast Ratios: Adhere to Web Content Accessibility Guidelines (WCAG) by ensuring sufficient contrast ratios between text and background. Tools like color contrast checkers can assist in evaluating and adjusting font-weight for optimal readability.

  • Responsive Font Sizes: Design with responsive font sizes that accommodate various user preferences. Allow users to adjust the font size without compromising the intended emphasis conveyed through font-weight.

  • Use Semantic HTML Elements: Employ semantic HTML elements and attributes to enhance the structure of your content. Screen readers rely on semantic markup to provide context, and a well-structured document ensures that font-weight contributes to a clear hierarchy.

  • Provide User Options: Implement user-friendly options within your website that allow users to choose font weights according to their preferences. This empowers individuals with visual impairments to tailor their experience for maximum comfort and accessibility.

  • Testing Across Assistive Technologies: Thoroughly test your website’s font-weight across various assistive technologies, including screen readers and magnifiers. This practice ensures that your chosen font weights contribute positively to the overall accessibility of your content.

By intertwining the design choices related to font-weight with a commitment to accessibility, web developers can foster an inclusive online environment where all users, regardless of visual abilities, can engage with digital content seamlessly. Here is a table comparing various font-weight and their usage.

To quickly customize and control the visual presentation of your text contents, visit Purecode. Purecode offers over 10,000+ AI-generated ready-made templates and components for your next project, all of which can be customized to suit your needs. Whether you’re a seasoned developer or just starting, purecode.ai can help you create stunning, accessible, and maintainable websites that delight your users.

Final Thoughts

In conclusion, the ‘font-weight’ property in CSS is a powerful tool that allows developers to control the visual appearance of text on a webpage. It plays a significant role in the overall aesthetics of a webpage, and when used correctly, it can enhance the user experience. However, it also has implications for accessibility, particularly for users with visual impairments. Therefore, it’s crucial to use ‘font-weight’ judiciously to ensure that your webpage is accessible to all users.

Looking ahead, the future of ‘font-weight’ in CSS is likely to be influenced by the evolution of variable fonts, which offer much finer granularity in weight, giving designers and developers more control over the chosen weight.

In the meantime, best practices for using ‘font-weight’ include understanding the available weights for your chosen font, choosing weights that enhance readability and legibility, and considering the accessibility implications of your choices. By doing so, you can ensure that your webpage is not only visually appealing but also accessible to all users.

If you want to learn more about font weight in CSS, check out this video below:

Victor Yakubu

Victor Yakubu