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1 Why validate HTML?

Validating your HTML code means checking it for syntax errors, typos, missing tags, and other issues that can affect how your web page looks and functions. Validation can help you find and fix bugs, ensure cross-browser compatibility, enhance accessibility, and comply with web standards. There are different ways to validate your HTML code, such as using online validators, browser extensions, code editors, or testing tools.

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Forum Bhatt

SDE @Fidelity Investments | Enabling organizations with Microservice applications (Java, Python, JavaScript), Database Performances (SQL, NoSQL), Model Big Data-Leverage Cloud(AWS, GCP) and CI/CD for 35% cost reduction
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Validating HTML (Hypertext Markup Language) is an important practice for several reasons: 1. Compliance with Standards: Validating HTML ensures that your web pages adhere to these standards, promoting consistency and compatibility across different browsers and devices. 2. Cross-Browser Compatibility: Different web browsers may interpret HTML code slightly differently. Validating HTML helps identify code errors or inconsistencies that might cause rendering issues or functionality discrepancies across different browsers. 3. Semantic Structure: Validating HTML ensures that your web pages have a well-structured and semantically correct markup, making it easier for search engines to understand the content and improve search engine optimization.

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Nihat Safarli

Software Developer | Proficient in C#, .NET, JS, React JS, PL/SQL
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There are a number of reasons why it is important to validate HTML: It makes your website more accessible. Valid HTML is more likely to be rendered correctly by all browsers and devices. This means that people with disabilities will be able to access and use your website more easily. It makes your website easier for search engines to understand. Search engines use HTML validation to help them understand the structure and content of your website. This helps them to index your website more accurately and serve it up to users in relevant search results.

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Nihat Safarli

Software Developer | Proficient in C#, .NET, JS, React JS, PL/SQL
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It makes your website more maintainable and reusable. Valid HTML is easier to read and understand, which makes it easier to maintain and update. It is also easier to reuse valid HTML code in other projects. It helps you to identify and fix errors in your code. HTML validation can help you to identify errors in your code, such as missing or mismatched tags, invalid attributes, and incorrect syntax. This can help you to prevent problems with your website and improve its overall quality.

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2 How to use online validators?

One of the easiest ways to validate your HTML code is to use an online validator, such as the W3C Markup Validation Service. This tool allows you to enter your URL, upload your file, or paste your code, and then it will check it for errors and warnings. It will also provide you with suggestions and explanations on how to fix them. Online validators are useful for quick checks and feedback, but they may not catch all the issues or reflect the latest standards.

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Forum Bhatt

SDE @Fidelity Investments | Enabling organizations with Microservice applications (Java, Python, JavaScript), Database Performances (SQL, NoSQL), Model Big Data-Leverage Cloud(AWS, GCP) and CI/CD for 35% cost reduction
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While online validators are helpful for quick checks and providing feedback on HTML code, there are a few reasons why they may not be sufficient on their own due to: 1. Incomplete Standard Coverage: Web development is a rapidly evolving field, and new features, elements, and attributes may not be fully supported by the validator. 2. Lack of Customization: Validators may provide some customization for specific validation rules, but may not allow you to define or enforce project-specific coding standards or guidelines. 3. Dynamic and Interactive Elements: Certain issues related to dynamic behavior, user interactions, or functionality may not be captured by the validator.

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Nihat Safarli

Software Developer | Proficient in C#, .NET, JS, React JS, PL/SQL
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To use online HTML validators, follow these steps: Choose a reputable online HTML validator. Some popular options include: W3C Markup Validation Service Nu Html Checker Markup Validation Service Enter the URL of your web page, upload your HTML file, or paste your code directly into the validator. Click the "Validate" or "Check" button to start the validation process. Review the results. The validator will display a report with information about errors, warnings, and suggestions for improvements. Each issue is typically accompanied by the line number where it occurs. Fix any errors or warnings that the validator identifies. Revalidate your code to make sure that you have fixed all of the issues.

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Nihat Safarli

Software Developer | Proficient in C#, .NET, JS, React JS, PL/SQL
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Here are some tips for using online HTML validators: Make sure that you are using a reputable validator. There are some validators that are not accurate or reliable. If you are validating a web page, make sure that the page is fully loaded before you start the validation process. If you are uploading an HTML file, make sure that the file is valid UTF-8 encoding. If you are pasting your code into the validator, make sure that you paste the entire code, including the <html> and </html> tags. Review the results carefully. The validator may identify errors or warnings that you are not aware of. Fix all of the errors and warnings that the validator identifies.

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3 How to use browser extensions?

Another way to validate your HTML code is to use a browser extension, such as HTML Validator for Firefox or Validity for Chrome. These extensions add a button or an icon to your browser toolbar that lets you validate the HTML code of any web page you visit. They also display the number of errors and warnings in the browser status bar or in a pop-up window. Browser extensions are convenient for testing your web pages locally or online, but they may not work with some dynamic or secure pages.

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Nihat Safarli

Software Developer | Proficient in C#, .NET, JS, React JS, PL/SQL
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To use browser extensions, follow these steps: Open your browser's web store. For example, to open the Chrome Web Store, click the three dots in the top right corner of the browser window and select "More tools" > "Extensions". Find the extension you want to install and click "Add to Chrome". Review the permissions that the extension needs and click "Add extension". Once the extension is installed, you can access it from the browser's toolbar or from the extension's popup menu. To access the extension's popup menu, click the extension's icon in the browser's toolbar.

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Forum Bhatt

SDE @Fidelity Investments | Enabling organizations with Microservice applications (Java, Python, JavaScript), Database Performances (SQL, NoSQL), Model Big Data-Leverage Cloud(AWS, GCP) and CI/CD for 35% cost reduction
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The tip here is to: Remember to be cautious when installing extensions and ensure they come from trusted sources. Review user feedback and ratings to gauge their reliability and security. Additionally, be mindful of the permissions requested by extensions and grant only the necessary access for their intended functionality.

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Wes Lunnen

Full Stack Web Development
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Browser extensions are incredibly useful for a variety of cases that can streamline the development process tenfold if utilized correctly. Some examples include color pickers to get correct palates for custom stylings, screen simulators that can load your work onto different size displays to ensure seamless utilization across devices, and more! You can even develop your own to ensure your work environment is suited to you and expand your base of knowledge in other softwares.

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4 How to use code editors?

A third way to validate your HTML code is to use a code editor, such as Visual Studio Code, Sublime Text, or Atom. These editors have features that can help you write and debug your HTML code, such as syntax highlighting, auto-completion, indentation, formatting, and linting. Linting is a process that analyzes your code for potential errors and style issues, and shows them in the editor window or in a separate panel. Code editors are powerful for editing and debugging your HTML code, but they may require some configuration and customization.

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Jonathan Behar
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A third way to validate your HTML code is to use a code editor, such as Visual Studio Code, Sublime Text, or Atom. These editors have features that can help you write and debug your HTML code, such as syntax highlighting, auto-completion, indentation, formatting, lining and 3rd party extensions. Linting is a process that analyzes your code for potential errors and style issues, and shows them in the editor window or in a separate panel. Code editors are powerful for editing and debugging your HTML code, but they may require some configuration and customization. Some editers even have 3rd-party extensions that make it even easier to evaluate your code.

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Forum Bhatt

SDE @Fidelity Investments | Enabling organizations with Microservice applications (Java, Python, JavaScript), Database Performances (SQL, NoSQL), Model Big Data-Leverage Cloud(AWS, GCP) and CI/CD for 35% cost reduction
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Use Linter/Extension: Many code editors offer extensions or linter plugins specifically designed for HTML validation. These extensions check your HTML code against predefined rules or standards and provide real-time feedback on errors, warnings, and suggestions. Check the marketplace or extensions section of your code editor and search for HTML linter or validator extensions. Install and activate the extension that suits your needs.

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Wes Lunnen

Full Stack Web Development
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There are many great online options for code editors that have different features, supported languages, etc to allow you to practice with new systems in a managed, streamline way. Some editors also have thriving communities that can be the basis of new ideas for projects and allow you to reach out to other developers for feedback/collaborative efforts. One of my favorites is codepen!

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5 How to use testing tools?

A fourth way to validate your HTML code is to use a testing tool, such as HTML_CodeSniffer, Web Developer Toolbar, or Axe. These tools can help you test your HTML code for accessibility, performance, usability, and SEO issues, and provide you with reports and recommendations on how to improve them. Testing tools are essential for ensuring that your web pages are user-friendly, fast, and optimized, but they may not cover all the aspects of validation or debugging.

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6 How to debug HTML code?

Debugging your HTML code means finding and fixing the errors and problems that prevent your web page from working as intended. Debugging can involve using the validation and testing tools mentioned above, as well as using the browser's developer tools. The developer tools are a set of tools that allow you to inspect, modify, and interact with the HTML code, CSS styles, JavaScript scripts, network requests, and other elements of your web page. You can access the developer tools by pressing F12 or Ctrl+Shift+I on your keyboard, or by right-clicking on any element and selecting Inspect. The developer tools have different panels and features that can help you debug your HTML code, such as the Elements panel, the Console panel, the Sources panel, and the Network panel.

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Forum Bhatt

SDE @Fidelity Investments | Enabling organizations with Microservice applications (Java, Python, JavaScript), Database Performances (SQL, NoSQL), Model Big Data-Leverage Cloud(AWS, GCP) and CI/CD for 35% cost reduction
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Implementing automated tests for your HTML code can be an innovative way to catch errors and validate the functionality of your code. Tools like Selenium or Cypress provide the ability to write tests that simulate user interactions and validate the HTML structure, ensuring that it behaves as expected. Remember, debugging HTML code often involves a combination of approaches, including inspecting the elements, checking the browser console for errors, analyzing CSS styles, and validating the code against standards. By employing innovative techniques and leveraging available tools, you can streamline the debugging process and identify and fix HTML code issues more effectively.

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7 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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Jon Cameron

Software Craftsman | Full Stack | AWS Certified Cloud Practitioner
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I use a combination of manual tests, unit tests (Jest, Mocha, component testing library like @vue/test-utils or @testing-library/react), end-to-end testing like Selenium, Cypress or Playwright. Ideally, all unit and automated tests should be executed in a CI/CD pipeline. For manual tests, especially when debugging problems on specific devices, I like to use BrowserStack. For editor, I use vscode. You want to use whatever means is at your disposal to ensure the user experiences the intended experience.

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Cristianto Rian Tarra

Strategic Application Modernization, Governance, and Digital Transformation Expert at Sinarmas Agribusiness and Food
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Validating and debugging HTML is vital in front-end development. Automate tests with tools like Selenium and Cypress, covering code functionality. Check not only syntax but accessibility, performance, usability, and SEO. Additionally, use tools like PageSpeed Insights to assess site speed. Debug using browser developer tools to inspect elements, identify console errors, and analyze CSS. Combining these practices ensures code is valid, user-friendly, and optimized for speed and performance.

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How do you validate and debug your HTML code?

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1 Why validate HTML?

2 How to use online validators?

3 How to use browser extensions?

4 How to use code editors?

5 How to use testing tools?

6 How to debug HTML code?

7 Here’s what else to consider

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