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Olga D., Markup/Front-end developer

Last Updated: 4 Jul 2023

- 10 years of experience developing HTML/CSS/WP of any complexity - Creation semantic, fully responsive, and PixelPerfect HTML/CSS layouts for mobile and web applications - Upper-Intermediate English - Available ASAP

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Oleg A., PHP Backend Engineer

Gdansk, Poland
Last Updated: 2 Apr 2024
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- 11+ years of experience in web development and 4 years of experience in the Fintech domain. - Proficient in various PHP frameworks such as YII2, Laravel and Symfony. - Experienced in front-end technologies including HTML5, CSS3, SASS, LESS, and JavaScript. - Strong knowledge of APIs and integrating payment gateways (Crypto, APM, S2S). - Expertise in designing and developing secure web applications. - Familiarity with AWS, Microsoft Azure, and other cloud infrastructure management. - Proven track record of successfully delivering projects on time and within budget, receiving commendations for technical prowess, innovative solutions, and team collaboration. - Location: Poland - Available: ASAP

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Amazon Web Services (AWS)

Amazon Web Services (AWS)

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Qays A., Senior Flutter + Android Engineer

Last Updated: 14 Mar 2024

- 5+ years of experience in the IT industry - Code in multiple languages, with interest in Flutter/Dart, JavaScript/TypeScript/React/NodeJS and Ruby - Worked with Flutter since the initial release date - Fluent English - Fluent Arabic - Available ASAP

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Flutter   6 yr.


Android   6 yr.

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Nickson M., Senior Python/Golang Engineer

Kampala, Uganda
Last Updated: 4 Jul 2023
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- 6 years of experience in IT - 5 years of experience with Golang - 6 years of experience with Python - Fluent English - Available ASAP

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Python   6 yr.


Go   5 yr.

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Mohamed S., Senior XSLT Developer

Cairo, Egypt
Last Updated: 15 Mar 2024

- 11+ years of experience in IT - 10+ years of experience with XSLT/XML - Writing, testing and maintaining XSLT code that applies mapping on XML and output JATS XML & HTML - Familiar with many processing engines like Saxon (Java) - libxslt (C) - Python’s package - Upper-intermediate English - Available ASAP

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XML   10 yr.


XSLT   10 yr.

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Henry Akwerigbe
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This is a super team to work with. Through Upstaff, I have had multiple projects to work on. Work culture has been awesome, teammates have been super nice and collaborative, with a very professional management. There's always a project for you if you're into tech such Front-end, Back-end, Mobile Development, Fullstack, Data Analytics, QA, Machine Learning / AI, Web3, Gaming and lots more. It gets even better because many projects even allow full remote from anywhere! Nice job to the Upstaff Team 🙌🏽.
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I have been working with Upstaff for over a year on a project related to landscape design and management of contractors in land design projects. During the project, we have done a lot of work on migrating the project to a multitenant architecture and are currently working on new features from the backlog. When we started this project, the hiring processes were organized well. Everything went smoothly, and we were able to start working quickly. Payments always come on time, and there is always support from managers. All issues are resolved quickly. Overall, I am very happy with my experience working with Upstaff, and I recommend them to anyone looking for a new project. They are a reliable company that provides great projects and conditions. I highly recommend them to anyone looking for a partner for their next project.
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Владислав «Sheepbar» Баранов
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Yanina Antipova
Yanina Antipova
Хочу виразити велику подяку за таку швидку роботу по підбору двох розробників. Та ще й у такий короткий термін-2 дні. Це мене здивувало, адже ми шукали вже цілий місяць. І знайдені кандидати нам не підходили Це щось неймовірне. Доречі, ці кандидати працюють у нас і зараз. Та надать приклад іншим працівникам. Гарного дня!)
Наталья Кравцова
Наталья Кравцова
I discovered an exciting and well-paying project on Upstaff, and I couldn't be happier with my experience. Upstaff's platform is a gem for freelancers like me. It not only connects you with intriguing projects but also ensures fair compensation and a seamless work environment. If you're a programmer seeking quality opportunities, I highly recommend Upstaff.
Leaving a review to express how delighted I am to have found such a great side gig here. The project is intriguing, and I'm really enjoying the team dynamics. I'm also quite satisfied with the compensation aspect. It's crucial to feel valued for the work you put in. Overall, I'm grateful for the opportunity to contribute to this project and share my expertise. I'm thrilled to give a shoutout and recommendation to anyone seeking an engaging and rewarding work opportunity.

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FAQs about CSS Development

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If you urgently need a verified and qualified CSS developer, and resources for finding the right candidate are lacking, UPSTAFF is exactly the service you need. We approach the selection of CSS developers professionally, tailored precisely to your needs. From placing the call to the completion of your task by a qualified developer, only a few days will pass.

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AI tools and expert human reviewers in the vetting process are combined with a track record and historically collected feedback from clients and teammates. On average, we save over 50 hours for client teams in interviewing CSS candidates for each job position. We are fueled by a passion for technical expertise, drawn from our deep understanding of the industry.

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Our journey starts with a 30-minute discovery call to explore your project challenges, technical needs, and team diversity. Meet Carefully Matched CSS Talents. Within 1-3 days, we’ll share profiles and connect you with the right talents for your project. Schedule a call to meet engineers in person. Validate Your Choice. Bring a new CSS developer on board with a trial period to confirm that you’ve hired the right one. There are no termination fees or hidden costs.

How does Upstaff vet remote CSS engineers? Arrow

Upstaff Managers conduct an introductory round with potential candidates to assess their soft skills. Additionally, the talent’s hard skills are evaluated through testing or verification by a qualified developer during a technical interview. The Upstaff Staffing Platform stores data on past and present CSS candidates. Upstaff managers also assess talent and facilitate rapid work and scalability, offering clients valuable insights into their talent pipeline. Additionally, we have a matching system within the platform that operates in real-time, facilitating efficient pairing of candidates with suitable positions.

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Table of Contents

TOP 10 CSS Related Technologies

  • CSS

    CSS (Cascading Style Sheets) is a fundamental technology for web development. It is used to style and format the layout of web pages. CSS allows developers to control the appearance of HTML elements, such as fonts, colors, and spacing, making it an essential tool for creating visually appealing websites.

  • HTML

    HTML (Hypertext Markup Language) is the standard markup language for creating web pages. It provides the structure and content of a webpage, defining the various elements and their relationships. HTML is a foundational technology for web development and is often used in conjunction with CSS and JavaScript.

  • JavaScript

    JavaScript is a versatile programming language that is widely used in web development. It allows developers to add interactivity and dynamic functionality to web pages. JavaScript can be used to manipulate HTML and CSS elements, handle user input, and perform calculations, making it an essential technology for creating interactive websites.

  • Bootstrap

    Bootstrap is a popular open-source CSS framework that simplifies the process of building responsive and mobile-first websites. It provides a collection of pre-built CSS styles and components, allowing developers to quickly create visually appealing and responsive web pages without the need for extensive custom CSS coding.

  • Sass

    Sass (Syntactically Awesome Style Sheets) is a CSS preprocessor that extends the functionality of CSS. It introduces features like variables, nesting, and mixins, which help streamline the CSS development process. Sass compiles into standard CSS, making it compatible with all modern web browsers.

  • React

    React is a popular JavaScript library for building user interfaces. It allows developers to create reusable UI components and efficiently manage the state of web applications. React uses a virtual DOM (Document Object Model) for efficient rendering, making it a preferred choice for building complex and high-performance web applications.

  • Vue.js

    Vue.js is a progressive JavaScript framework for building user interfaces. It emphasizes simplicity and ease of use, making it a popular choice among developers. Vue.js allows for reactive data binding and component-based architecture, enabling developers to create interactive and scalable web applications.

Let’s consider Difference between Junior, Middle, Senior, Expert/Team Lead developer roles.

Seniority NameYears of experienceResponsibilities and activitiesAverage salary (USD/year)
Junior0-2 yearsAssisting with basic programming tasks, bug fixing, and code maintenance. Learning new technologies and processes. Collaborating with team members under close supervision.$55,000 – $75,000
Middle2-5 yearsDeveloping and implementing features, modules, and components. Participating in code reviews and providing constructive feedback. Assisting junior developers and collaborating with cross-functional teams.$75,000 – $100,000
Senior5+ yearsLeading complex projects and making technical decisions. Mentoring and guiding junior and middle developers. Collaborating with stakeholders to define project requirements and deliver high-quality solutions.$100,000 – $130,000
Expert/Team Lead8+ yearsLeading a team of developers and managing project timelines. Architecting and designing software solutions. Providing technical expertise and guidance. Collaborating with stakeholders at all levels of the organization.$130,000 – $160,000

How and where is CSS used?

Case NameCase Description
Responsive Web DesignCSS development is essential for creating responsive web designs that adapt to different screen sizes and devices. With CSS media queries, developers can apply different styles and layouts based on the user’s device, allowing for optimal viewing experiences across desktops, tablets, and smartphones.
Animations and TransitionsCSS provides powerful tools for creating animations and transitions on web pages. Developers can use CSS keyframes and transitions to add smooth and visually appealing effects to elements, enhancing user engagement and interactivity.
Custom Styling and BrandingCSS allows developers to customize the appearance of web pages, enabling them to create unique and branded designs. By defining styles for elements such as fonts, colors, backgrounds, and borders, developers can ensure consistent branding and visual identity across their websites.
Layout ControlCSS provides precise control over the layout of web pages. Developers can use CSS positioning, flexbox, and grid systems to arrange elements in specific ways, defining their placement, alignment, and order. This level of control is crucial for creating complex and structured page layouts.
Print StylingCSS can be used to define specific styles for printed documents, allowing developers to optimize the appearance of web pages when they are printed. This includes adjusting page breaks, hiding unnecessary elements, and ensuring the content is presented in a readable and visually appealing manner.
Accessibility EnhancementCSS development plays a significant role in enhancing the accessibility of web pages. By using CSS to define proper heading structures, color contrasts, and text formatting, developers can ensure that their websites are more accessible to individuals with disabilities, improving usability and inclusivity.

Hard skills of a CSS Developer

Hard skills of a CSS Developer: CSS developers play a crucial role in creating visually appealing and user-friendly websites. Here are the hard skills required for different levels of expertise:


  • CSS Fundamentals: Proficiency in understanding and applying CSS selectors, properties, and values.
  • Responsive Design: Ability to create websites that adapt to different screen sizes using media queries and responsive design techniques.
  • Cross-Browser Compatibility: Knowledge of browser-specific quirks and techniques to ensure consistent rendering across different browsers.
  • Basic Layouts: Understanding of CSS box model, positioning, and layout techniques like flexbox and grid.
  • CSS Preprocessors: Familiarity with CSS preprocessors like Sass or Less for efficient and modular CSS development.


  • Advanced Selectors: Proficiency in using advanced CSS selectors, pseudo-classes, and pseudo-elements to target specific elements.
  • Animations and Transitions: Knowledge of CSS animations, transitions, and keyframes to add interactive and engaging effects to websites.
  • Performance Optimization: Understanding of techniques like minification, caching, and optimizing CSS delivery for improved website performance.
  • CSS Frameworks: Experience with popular CSS frameworks like Bootstrap or Foundation for rapid development and consistent styling.
  • Version Control: Proficient in using version control systems like Git to manage and collaborate on CSS code.
  • Accessibility: Knowledge of web accessibility standards and techniques to ensure websites are usable by people with disabilities.
  • Debugging: Ability to use browser developer tools to identify and fix CSS-related issues and bugs.


  • Advanced Layouts: Mastery in creating complex layouts using CSS grid, multi-column layouts, and advanced positioning techniques.
  • Performance Optimization: Expertise in optimizing CSS for improved rendering speed and reducing page load times.
  • Custom CSS Frameworks: Ability to create custom CSS frameworks tailored to project requirements for greater control and scalability.
  • Preprocessor Mastery: Proficiency in advanced features of CSS preprocessors like mixins, functions, and modular architecture.
  • UI/UX Design Principles: Understanding of user-centered design principles and ability to translate design mockups into CSS code.
  • Code Reviews: Experience in conducting code reviews to ensure code quality, maintainability, and adherence to best practices.
  • Performance Auditing: Knowledge of tools and techniques to analyze and optimize CSS performance for large-scale projects.
  • Team Collaboration: Ability to lead and collaborate with a team of developers, providing guidance and mentorship.

Expert/Team Lead

  • Advanced CSS Architecture: Mastery in architecting scalable and maintainable CSS codebases using methodologies like BEM or SMACSS.
  • Design Systems: Experience in creating and maintaining design systems for consistent and reusable UI components.
  • CSS-in-JS: Proficiency in using CSS-in-JS libraries to write CSS code directly within JavaScript components.
  • Performance Optimization Strategies: Expertise in implementing advanced performance optimization strategies like critical CSS, lazy loading, and code splitting.
  • Codebase Refactoring: Ability to refactor and optimize legacy CSS codebases for improved maintainability and performance.
  • Architectural Decision Making: Experience in making architectural decisions related to CSS code organization, tooling, and workflow.
  • Leadership: Strong leadership skills to mentor and guide junior developers, oversee project timelines, and drive technical excellence.
  • Technical Documentation: Ability to create comprehensive technical documentation for CSS codebases and style guidelines.
  • Performance Auditing: Expertise in identifying and resolving performance bottlenecks in CSS for large-scale and high-traffic websites.
  • Client Communication: Excellent communication skills to effectively communicate technical concepts and solutions to clients and stakeholders.
  • Continuous Learning: Proactive in staying updated with the latest CSS trends, techniques, and best practices.

TOP 12 Facts about CSS

  • CSS stands for Cascading Style Sheets.
  • It is a styling language used to describe the presentation of a document written in HTML or XML.
  • CSS is the standard way to style web pages and is supported by all modern web browsers.
  • It helps separate the content of a web page from its presentation, making it easier to maintain and update.
  • CSS provides a wide range of styling options, including font styles, colors, backgrounds, layout positioning, and more.
  • It uses a cascading model, where multiple style rules can be applied to the same element, with the most specific rule taking precedence.
  • CSS selectors allow you to target specific elements on a web page and apply styles to them selectively.
  • Stylesheets can be applied to multiple web pages, making it efficient and consistent to style an entire website.
  • CSS3 is the latest version of CSS and introduced many new features and enhancements, including animations, transitions, and flexible box layouts.
  • CSS can be used to create responsive web designs that adapt to different screen sizes and devices.
  • CSS preprocessors, such as Sass and Less, extend the capabilities of CSS by adding variables, functions, and other advanced features.
  • CSS frameworks, like Bootstrap and Foundation, provide pre-designed CSS styles and components to speed up web development.

Pros & cons of CSS

7 Pros of CSS

  • CSS allows for separation of content and presentation, making it easier to maintain and update websites.
  • It provides a consistent and uniform look across multiple web pages, enhancing user experience.
  • CSS offers a wide range of styling options, giving web designers flexibility in creating visually appealing websites.
  • It improves website loading speed by reducing the amount of code required compared to inline styling.
  • CSS supports responsive design, enabling websites to adapt and display properly on different devices and screen sizes.
  • It allows for easy customization and reusability of styles, reducing development time and effort.
  • CSS is supported by all modern web browsers, ensuring compatibility across platforms.

7 Cons of CSS

  • CSS can be challenging for beginners to learn due to its complex syntax and many properties.
  • Browser compatibility issues may arise, requiring additional code or workarounds to ensure consistent display across different browsers.
  • Managing large CSS files can become difficult, leading to code duplication and increased file sizes.
  • Specificity conflicts can occur when multiple CSS rules target the same element, resulting in unexpected styling outcomes.
  • Modifying the layout of a website with CSS alone may be limited, requiring additional HTML or JavaScript changes.
  • CSS lacks support for variables and calculations, making certain tasks more cumbersome.
  • Debugging CSS issues can be time-consuming and challenging, especially when dealing with complex layouts and inheritance.

TOP 12 Tech facts and history of creation and versions about CSS Development

  • CSS stands for Cascading Style Sheets and is a styling language used for describing the look and formatting of a document written in HTML.
  • CSS was first proposed by Håkon Wium Lie and Bert Bos in 1994, and the first CSS specification was released in 1996.
  • The earliest versions of CSS were limited in their capabilities, but with each new version, CSS has become more powerful and feature-rich.
  • CSS1, released in 1996, introduced the basic styling properties like font, color, and background.
  • CSS2, released in 1998, added support for positioning, floating elements, and enhanced the layout capabilities of webpages.
  • CSS3 is not a single specification but a collection of modules that are being developed independently. It introduces many new features like animations, transitions, and flexible box layout.
  • Flexbox, a layout module introduced in CSS3, revolutionized the way we design responsive web layouts by providing a flexible and efficient way to align and distribute elements.
  • Grid Layout, another module introduced in CSS3, allows for complex two-dimensional layouts, enabling designers to create more sophisticated and responsive designs.
  • Media queries, introduced in CSS3, allow developers to apply different styles based on the characteristics of the device or screen size, enabling responsive web design.
  • CSS preprocessors like Sass and Less have gained popularity among developers for their ability to add programming features like variables, functions, and mixins to CSS, making it more efficient and maintainable.
  • CSS frameworks like Bootstrap and Foundation provide a collection of pre-built CSS and JavaScript components that help developers build responsive and visually appealing websites more easily.
  • CSS-in-JS is a relatively new approach where CSS is written in JavaScript syntax, allowing developers to style components more dynamically and encapsulate styles within the component itself.

Soft skills of a CSS Developer

Soft skills are essential for a CSS Developer as they contribute to effective collaboration, communication, and problem-solving in a team environment. These skills are highly valued by employers and can greatly enhance a developer’s professional growth and career prospects.


  • Adaptability: Capable of quickly learning new technologies and adapting to changes in project requirements.
  • Attention to Detail: Pays close attention to the fine details of design and ensures accuracy in implementation.
  • Time Management: Efficiently manages time and meets deadlines for assigned tasks.
  • Teamwork: Works well in a team, actively participates in discussions, and contributes to the success of the project.
  • Communication: Effectively communicates with team members and stakeholders, seeking clarification when needed.


  • Problem Solving: Able to analyze complex design challenges and implement effective solutions.
  • Critical Thinking: Applies logical reasoning and evaluates different approaches to find the most optimal solution.
  • Collaboration: Collaborates with cross-functional teams, understanding and incorporating feedback from various stakeholders.
  • Leadership: Takes ownership of tasks, guides and mentors junior team members, and assists in project planning.
  • Client Management: Establishes and maintains good relationships with clients, ensuring their needs are met.
  • Empathy: Understands and empathizes with users, considering their perspective during design and implementation.
  • Continuous Learning: Actively seeks opportunities to enhance skills, keeps up with industry trends and best practices.


  • Strategic Thinking: Takes a holistic approach to projects, considering long-term goals and overall project success.
  • Conflict Resolution: Capable of resolving conflicts within the team and finding a mutually beneficial solution.
  • Project Management: Oversees project timelines, allocates resources, and ensures timely delivery of high-quality work.
  • Client Relationship Management: Builds and maintains strong relationships with clients, acting as a trusted advisor.
  • Presentation Skills: Presents work effectively to clients and stakeholders, conveying complex concepts in a clear manner.
  • Innovation: Identifies opportunities for innovation and brings creative ideas to enhance the user experience.
  • Mentorship: Actively mentors junior developers, providing guidance and support to foster their professional growth.
  • Adaptability: Quickly adapts to changing project requirements and effectively manages evolving priorities.

Expert/Team Lead

  • Strategic Leadership: Provides strategic direction to the team, aligning their efforts with organizational goals.
  • Decision Making: Makes informed decisions based on extensive experience and deep understanding of the domain.
  • Conflict Resolution: Resolves complex conflicts within the team, promoting a harmonious and productive work environment.
  • Influencing Skills: Influences stakeholders and clients to adopt best practices and make informed decisions.
  • Process Improvement: Identifies areas for process improvement, implements changes, and drives efficiency.
  • Technical Expertise: Possesses advanced knowledge of CSS and related technologies, serving as a subject matter expert.
  • Strategic Partnerships: Builds strategic partnerships with clients and stakeholders to drive business growth.
  • Team Building: Builds high-performing teams, fosters a positive culture, and attracts top talent to the organization.
  • Risk Management: Identifies and mitigates project risks, ensuring smooth execution and delivery.
  • Business Acumen: Understands the business context of projects and makes decisions aligned with organizational objectives.
  • Industry Thought Leadership: Actively contributes to the industry through speaking engagements, writing, and mentorship.

What are top CSS instruments and tools?

  • Bootstrap: Bootstrap is a popular front-end framework that provides a collection of CSS and JavaScript components for building responsive and mobile-first websites. It was initially released in 2011 and has since gained widespread popularity due to its ease of use and extensive documentation. Bootstrap is known for its grid system, which helps developers create responsive layouts, and its library of pre-styled components, such as buttons, forms, and navigation menus.
  • Sass: Sass (Syntactically Awesome Style Sheets) is a CSS preprocessor that extends the capabilities of CSS with features like variables, nesting, mixins, and functions. It was first introduced in 2006 and has become a popular choice among developers for writing more maintainable and modular CSS code. Sass allows for the use of variables to store reusable values, nesting to improve code organization, and mixins to define reusable styles. It also supports the use of functions, allowing for dynamic styles based on calculations and conditions.
  • PostCSS: PostCSS is a versatile tool that allows developers to transform CSS with JavaScript plugins. It was released in 2013 and has gained popularity due to its flexibility and extensibility. PostCSS can be used for various tasks, such as autoprefixing vendor-specific CSS properties, linting, minifying, and optimizing CSS code. It has a wide range of plugins available, allowing developers to customize their CSS processing pipeline according to their specific needs.
  • Tailwind CSS: Tailwind CSS is a utility-first CSS framework that provides a set of pre-defined utility classes for quickly building user interfaces. It was first introduced in 2017 and has gained traction among developers who prefer a more utility-focused approach to styling. Tailwind CSS allows developers to compose styles by applying utility classes directly in their HTML markup, eliminating the need for writing custom CSS. It provides a comprehensive set of utility classes for common CSS properties, such as margins, padding, typography, and colors.
  • CSS Grid: CSS Grid is a layout system introduced in CSS3 that allows for the creation of complex grid-based layouts. It provides a two-dimensional grid structure, enabling precise control over the placement and alignment of elements on a webpage. CSS Grid was first implemented in major browsers in 2017 and has since become widely supported. It offers a more intuitive and powerful way to create responsive and flexible layouts compared to traditional CSS frameworks. With CSS Grid, developers can define rows, columns, and grid areas, and easily adjust the layout based on different screen sizes.
  • LESS: LESS is a CSS preprocessor that was released in 2009 as an alternative to Sass. It offers similar features to Sass, such as variables, mixins, and nesting, but with a slightly different syntax. LESS is known for its simplicity and easy integration with existing projects. It compiles into regular CSS, making it compatible with all modern browsers. While Sass has gained more popularity among developers, LESS continues to be used by some developers who prefer its syntax or have legacy projects that rely on it.

Cases when CSS does not work

  1. Browser Compatibility: CSS may not work consistently across different web browsers, especially older versions. According to the Can I use website, as of February 2022, there are still cases where certain CSS properties or features have limited support or behave differently in various browsers.
  2. Incorrect Syntax: If the CSS code contains syntax errors, the styles may not be applied correctly. Even a small typo or missing curly bracket can cause the entire CSS block to fail.
  3. Specificity: CSS follows a specificity hierarchy to determine which styles should be applied when multiple rules target the same element. If more specific selectors are defined elsewhere in the code, they may override the desired styles.
  4. Cascading Order: The order in which CSS rules are declared can impact their effectiveness. If a later rule contradicts or overrides a previously declared rule, the desired styles may not be applied.
  5. Inline Styles: Inline styles, those defined within the HTML tags using the `style` attribute, take precedence over external stylesheets. If conflicting styles are defined inline, they may override the external CSS.
  6. Specific Element State: CSS can target specific states of an element, such as hover or focus. If the CSS rules are not properly defined or are conflicting for specific states, the styles may not be applied as expected.
  7. External Factors: CSS styling can also be affected by external factors such as content delivery networks (CDNs), server configurations, caching mechanisms, or proxy servers. These factors may interfere with the proper rendering of CSS styles.
  8. Browser Extensions or Plugins: Some browser extensions or plugins can modify or override CSS styles on webpages. If a user has such extensions installed, they might interfere with the expected CSS styling.
  9. Hardware Limitations: In rare cases, CSS styles may not appear as intended due to hardware limitations or issues. This could occur if the device or graphics card does not support certain CSS properties or rendering techniques.

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