| About
            CSS, short for Cascading Style Sheets, is a style sheet language used by web developers to structure the HTML and other elements of a website. CSS is one of the most widely used languages on the web. For style sheets to work, it is important that your markup be free of errors. A convenient way to automatically fix markup errors is to use the HTML Tidy utility. This also tidies the markup making it easier to read and easier to edit. I recommend you regularly run Tidy over any markup you are editing. Tidy is very effective at cleaning up markup created by authoring tools with sloppy habits. Each style property starts with the property's name, then a colon and lastly the value for this property. When there is more than one style property in the list, you need to use a semicolon between each of them to delimit one property from the next.
             | About
            Perl is a highly capable, feature-rich programming language with over 30 years of development. Perl is a highly capable, feature-rich programming language with over 30 years of development. Perl runs on over 100 platforms from portables to mainframes and is suitable for both rapid prototyping and large scale development projects. "Perl" is a family of languages, "Raku" (formerly known as "Perl 6") is part of the family, but it is a separate language which has its own development team. Its existence has no significant impact on the continuing development of "Perl". Perl includes powerful tools for processing text that make it ideal for working with HTML, XML, and all other mark-up and natural languages. Perl can handle encrypted Web data, including e-commerce transactions.
             | About
            Validate the performance and quality of your apps with real-world traffic scenarios. Preview code performance, quickly spot problems, and rest assured your app runs optimally when it’s time to release. Mimic real-life scenarios, test load, and create intelligent simulations of third-party and internal backend systems to better prepare for production. No need to spin up costly new environments each time you test. Built-in autoscaling drives your cloud costs down even further. Bypass complex, homegrown frameworks and manual test scripts so you can ship more code, faster. Be confident that new code changes can handle high-traffic scenarios. Prevent major outages, meet SLAs, and protect the customer experience. Simulate third-party systems and internal backends for more reliable, affordable testing. No need to spin up costly, end-to-end environments that take days to deploy. Seamlessly migrate off legacy architecture without disrupting the customer experience. 
             | About
            Extensible Markup Language (XML) is a simple, very flexible text format derived from SGML (ISO 8879). Originally designed to meet the challenges of large-scale electronic publishing, XML is also playing an increasingly important role in the exchange of a wide variety of data on the Web and elsewhere. This page describes the work being done at W3C within the XML Activity, and how it is structured. Work at W3C takes place in Working Groups. The Working Groups within the XML Activity are listed below, together with links to their individual web pages. You can find and download formal technical specifications here, because we publish them. This is not a place to find tutorials, products, courses, books or other XML-related information. There are some links below that may help you find such resources. You will find links to W3C Recommendations, Proposed Recommendations, Working Drafts, conformance test suites and other documents on the pages for each Working Group. 
             | |||
| Platforms Supported
            
                Windows
            
            
         
            
                Mac
            
            
         
            
                Linux
            
            
         
            
                Cloud
            
            
         
            
                On-Premises
            
            
         
            
                iPhone
            
            
         
            
                iPad
            
            
         
            
                Android
            
            
         
            
                Chromebook
            
            
         | Platforms Supported
            
                Windows
            
            
         
            
                Mac
            
            
         
            
                Linux
            
            
         
            
                Cloud
            
            
         
            
                On-Premises
            
            
         
            
                iPhone
            
            
         
            
                iPad
            
            
         
            
                Android
            
            
         
            
                Chromebook
            
            
         | Platforms Supported
            
                Windows
            
            
         
            
                Mac
            
            
         
            
                Linux
            
            
         
            
                Cloud
            
            
         
            
                On-Premises
            
            
         
            
                iPhone
            
            
         
            
                iPad
            
            
         
            
                Android
            
            
         
            
                Chromebook
            
            
         | Platforms Supported
            
                Windows
            
            
         
            
                Mac
            
            
         
            
                Linux
            
            
         
            
                Cloud
            
            
         
            
                On-Premises
            
            
         
            
                iPhone
            
            
         
            
                iPad
            
            
         
            
                Android
            
            
         
            
                Chromebook
            
            
         | |||
| Audience
        Web developers
         | Audience
        Developers looking for a Programming Language solution
         | Audience
        Businesses interested in a tool to build resilient, performant Kubernetes apps
         | Audience
        Developers and professionals seeking a solution to build custom, enterprise-grade apps
         | |||
| Support
            
                Phone Support
            
            
         
            
                24/7 Live Support
            
            
         
            
                Online
            
            
         | Support
            
                Phone Support
            
            
         
            
                24/7 Live Support
            
            
         
            
                Online
            
            
         | Support
            
                Phone Support
            
            
         
            
                24/7 Live Support
            
            
         
            
                Online
            
            
         | Support
            
                Phone Support
            
            
         
            
                24/7 Live Support
            
            
         
            
                Online
            
            
         | |||
| API
            
                Offers API
            
            
         | API
            
                Offers API
            
            
         | API
            
                Offers API
            
            
         | API
            
                Offers API
            
            
         | |||
| Screenshots and Videos | Screenshots and Videos | Screenshots and Videos | Screenshots and Videos | |||
| Pricing
        Free
        
     
            
                Free Version
            
            
         
            
                Free Trial
            
            
         | Pricing
        Free
        
     
            
                Free Version
            
            
         
            
                Free Trial
            
            
         | Pricing
        $100 per GB
        
     
            
                Free Version
            
            
         
            
                Free Trial
            
            
         | Pricing
        Free
        
     
            
                Free Version
            
            
         
            
                Free Trial
            
            
         | |||
| 
Reviews/ | 
Reviews/ | 
Reviews/ | 
Reviews/ | |||
| Training
            
                Documentation
            
            
         
            
                Webinars
            
            
         
            
                Live Online
            
            
         
            
                In Person
            
            
         | Training
            
                Documentation
            
            
         
            
                Webinars
            
            
         
            
                Live Online
            
            
         
            
                In Person
            
            
         | Training
            
                Documentation
            
            
         
            
                Webinars
            
            
         
            
                Live Online
            
            
         
            
                In Person
            
            
         | Training
            
                Documentation
            
            
         
            
                Webinars
            
            
         
            
                Live Online
            
            
         
            
                In Person
            
            
         | |||
| Company InformationCSS Founded: 1996 www.w3schools.com/css/ | Company InformationPerl www.perl.org | Company InformationSpeedscale United States speedscale.com | Company InformationWorld Wide Web Consortium (W3C) Founded: 1996 www.w3.org/XML/ | |||
| Alternatives | Alternatives | Alternatives | Alternatives | |||
|  | ||||||
|  | ||||||
|  | ||||||
|  |  |  | ||||
| Categories | Categories | Categories | Categories | |||
| Integrations
            
                
    Activepieces
            
            
         
            
                
    Amp
            
            
         
            
                
    Checkmarx
            
            
         
            
                
    Claude Sonnet 4
            
            
         
            
                
    Coolors
            
            
         
            
                
    Fat-Free Framework
            
            
         
            
                
    GPT-4.5
            
            
         
            
                
    GPT-4o
            
            
         
            
                
    Ideagen Smartforms
            
            
         
            
                
    Kombai
            
            
         | Integrations
            
                
    Activepieces
            
            
         
            
                
    Amp
            
            
         
            
                
    Checkmarx
            
            
         
            
                
    Claude Sonnet 4
            
            
         
            
                
    Coolors
            
            
         
            
                
    Fat-Free Framework
            
            
         
            
                
    GPT-4.5
            
            
         
            
                
    GPT-4o
            
            
         
            
                
    Ideagen Smartforms
            
            
         
            
                
    Kombai
            
            
         | Integrations
            
                
    Activepieces
            
            
         
            
                
    Amp
            
            
         
            
                
    Checkmarx
            
            
         
            
                
    Claude Sonnet 4
            
            
         
            
                
    Coolors
            
            
         
            
                
    Fat-Free Framework
            
            
         
            
                
    GPT-4.5
            
            
         
            
                
    GPT-4o
            
            
         
            
                
    Ideagen Smartforms
            
            
         
            
                
    Kombai
            
            
         | Integrations
            
                
    Activepieces
            
            
         
            
                
    Amp
            
            
         
            
                
    Checkmarx
            
            
         
            
                
    Claude Sonnet 4
            
            
         
            
                
    Coolors
            
            
         
            
                
    Fat-Free Framework
            
            
         
            
                
    GPT-4.5
            
            
         
            
                
    GPT-4o
            
            
         
            
                
    Ideagen Smartforms
            
            
         
            
                
    Kombai
            
            
         | |||
|  |  |  |  | 
 
         
         
        