Validate my html code

Проверить HTML код на валидность

HTML-валидатор W3C (англ. W3C HTML Validator) — бесплатный OnLine сервис для проверки синтаксиса HTML и XHTML-кода на наличие ошибок.

Сервис поддерживает IDN-домены и для их проверки не требуется переводить имя домена в Punycode. Просто введите введите адрес вашего кириллического домена и проверьте его на наличие ошибок в HTML коде.

* На время выполнения этой операции влияет размер страницы, время ответа сервера, загруженность сети и скорость подключения.

Валидатор HTML кода

Валидатор HTML кода является анализатором соответствия стандарту SGML, который сообщает о содержащихся ошибках в html коде страниц веб-сайта.

Validator — a conforming SGML parser that can find and report a reportable markup error if (and only if) one exists. SGML (Structured Generalized Markup Language) является структурированным обобщенным языком разметки документов. HTML входит в подмножество SGML.

HTML-валидатор производит несколько проверок Вашего кода. Основные из них:

• Валидация синтаксиса — проверка на наличие синтаксических ошибок. является корректным синтаксисом, несмотря на то, что не является допустимым HTML-тэгом, так что проверка синтаксиса является минимально полезной для написания хорошего HTML;
• Проверка вложенности тэгов — тэги должны быть закрыты в обратном порядке относительно их открытия. Например, эта проверка отлавливает ошибки с неправильно закрытыми ;
• Валидация DTD — проверка соответствия Вашего кода указанному Document Type Definition. Она включает проверку названий тэгов, атрибутов, и «встраивания» тэгов (тэги одного типа внутри тэгов другого типа);
• Проверка на посторонние элементы — проверка выявляет все, что есть в коде, но отсутствует в DTD. Например, пользовательские тэги и атрибуты.

Нужна ли HTML-валидация?!

Основным аргументом за валидацию HTML является обеспечение кроссбраузерности. Каждый браузер имеет свой парсер и «скармливать» ему то, что понимают все браузеры — это единственный путь быть уверенным, что Ваш код будет работать правильно во всех браузерах. Поскольку каждый браузер имеет свой механизм коррекции ошибок HTML Вы не можете полагаться на невалидный код.

Основным аргументом против валидации является то, что она слишком строгая и не соответствует тому, как на самом деле работают браузеры. Да, HTML может быть невалидным, но все браузеры могут обрабатывать некоторый невалидный код одинаково. Если я готов взять на себя ответственность за неправильный код, который я пишу, то я не должен беспокоиться о проверке. Единственное, о чем я должен заботиться — это чтобы оно работало.

Многие web-разработчики могут жаловаться на HTML валидаторы, вводящего ограничения для полета фантазии, потому что стандартные правила довольно жесткие. На самом деле правила есть правила, и их необходимо соблюдать. Грамотный специалист всегда сможет сделать качественный продукт, не выходя за рамки правил. От ошибок никто не застрахован, поэтому валидатор HTML кода — это очень нужный инструмент в работе любого веб-разработчика и веб-дизайнера.

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HTML Validator

HTML Validator is a free online developer tool to validate HTML code against the W3C standards as known as HTML linter instantly. Supports partial HTML code validation.

You can either browse an HTML file, fetch HTML code from a URL, or paste HTML code manually, and then click the validate button. The results will be displayed accordingly when the process is done.

Basically, there are two types of result messages: warning and error

Warning — A suggestion to fix your HTML code. For instance, an HTML attribute that can be omitted.

Error — An error in your HTML code that’s against the W3C standards. You’re encouraged to fix it.

Each message comes with a line number and excerpt code indicating where a warning or an error is located.

Optionally, you can partially validate HTML code by enabling the fragment option so that the HTML code will be treated as part of an HTML document instead of a full one.

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Free Online HTML Validator

This free online HTML validator (also known as HTML Linter) allows you to validate HTML code against the W3C standards.

Categories

Input

Output

HTML (Hypertext Markup Language) is a language used to create and structure web pages. It offers a structure for including text, pictures, and other types of media on a page and building links between them. Millions of developers worldwide use HTML, a crucial tool for web development. However, writing perfect HTML code can be challenging, especially for large and complex websites. This is where HTML validators come into play. If the code does not conform to the specification, the validator will report an error or warning.

Using a tool called HTML Validator, HTML code is examined for compliance with the HTML specification, and any errors or warnings are reported. It is employed in the process of developing websites to guarantee that the HTML code is accurate, adheres to best practices, and is compatible with a range of web browsers, gadgets, and platforms.

The HTML Validator examines the HTML code, compares it to the HTML specification kept up to date by the World Wide Web Consortium (W3C), and reports any errors or warnings it finds. Web designers can make their websites more user-friendly and high-quality while spending less time and effort maintaining and updating them thanks to the HTML Validator.

There are several reasons why validating HTML is important:

• Enhancing Accessibility: Enables you to check for accessibility issues, such as missing alt text for images, which can help ensure that websites are accessible to users with special needs.
• Enhancing Compatibility: Assures that the code will work with a variety of web browsers, devices, and platforms, which can enhance the user experience.
• Reduce Maintenance: Reduces the time and effort needed to maintain and update a website by helping to identify and fix coding errors.
• Enhancing SEO: Helps increase a website’s visibility in SERPs because search engines use HTML code to understand a website’s content and structure.

Anyone working with binary code needs a binary to decimal converter. They increase accuracy, reduce time spent on tasks, and make communication easier by bridging the gap between computer and human understanding. A binary to decimal converter is a vital tool in your toolbox, whether you’re a software developer, hardware engineer, or simply someone who needs to work with binary code.

What is HTML?

HTML (HyperText Markup Language) is the standard markup language used to create web pages. When combined with CSS and JavaScript, it gives web pages structure and content, allowing developers to build dynamic, engaging websites. Headings, paragraphs, images, and links are just a few of the elements used by HTML to define a web page’s content and layout. It is an essential part of developing websites and is supported by all the main web browsers.

What is the purpose of HTML Validator?

The HTML Validator’s purpose is to verify that HTML code adheres to the HTML specification and to report any errors or warnings it discovers. By using HTML Validator, developers can make sure their HTML code is accurate, adheres to industry standards, and works on a variety of web browsers, gadgets, and platforms. Developers can increase the quality and accessibility of their websites, as well as the time and effort needed to maintain and update them, by fixing HTML validation errors and warnings.

How does HTML Validator work?

HTML Validator works by analyzing HTML code and comparing it to the HTML specification maintained by the World Wide Web Consortium (W3C). The HTML Validator checks the code for correct syntax, proper use of tags and attributes, and compliance with the HTML specification. It identifies and reports any errors or warnings that it finds, such as missing tags, incorrect attribute values, and non-compliant code.

Why is HTML Validation important in web development?

HTML validation is crucial to web development because it helps guarantee that HTML code is accurate, adheres to best practices, and is compatible with various web browsers, devices, and platforms. By enhancing the HTML code’s quality and assisting in preventing errors, validation can improve compatibility, accessibility, and performance. Developers can ensure their websites are usable by everyone, including those with disabilities, and that they display properly on a range of gadgets and platforms by validating the HTML code in their websites.

What are the benefits of using HTML Validator?

Using HTML Validator has several advantages, including better performance, increased compatibility with a wide range of web browsers, devices, and platforms, and improved quality and accessibility of websites. HTML Validator assists in finding and fixing errors and warnings in HTML code, which can improve usability, accessibility, and compatibility.

What are the types of errors that can be identified by HTML Validator?

HTML Validator can detect a number of errors and warnings in HTML code, including missing tags, incorrect attribute values, incorrect use of tags and attributes, and non-compliant code. The HTML Validator can also spot problems with accessibility, like missing alt text for images and make code-improvement recommendations.

How do I use HTML Validator?

To use HTML Validator, you simply need to enter the HTML code you want to validate into the validator or upload a file with the HTML code. Following an analysis of the code by the HTML Validator, a report of any errors or cautions is provided. Then, until all errors and warnings have been fixed, you can modify the code to correct and revalidate them.

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HTML formatter

HTML Lint is the free online validator and reformatter tool for HTML ✅, a lightweight interchange format ✅. Copy and paste or directly type in the editor and let HTMLLint format and validate your HTML code ✅.

We don’t store any tracking cookies 🍪 And we do not store any input data. Your code is your ownership, we just make it prettier for you ✅.

How to lint HTML

css-formatter parses and validates your CSS. We’re checking for industry standards. And this will improve readability of your code.

Why linting HTML code

Linting HTML source code improves readability for your fellow developers and for yourself. It becomes clear where the several sections, headings, paragraphs, forms and buttons are.

Tips & Tricks

• If you want your HTML code to be clean. You can paste your whole script in the code section and let HTML Lint format your code.
• You can format CSS if you paste your CSS between . Or you can use CSS-formatter.com to format your CSS.
• You can format JS if you paste your Javascript between . Or you can use JS-Formatter.com to format your JavaScript.
• You can format XML, simply copy and paste your in the code section above. Or you can use XML-Lint.com to format your XML.
• You can format JSON at Format-JSON.com.

Calculate and visualize Cumulative Layout Shift of your website

In the year 2021 Google introduced Core Wev Vitals. It’s a way of measuring a page’s health based on a number of factors like page speed, readability, structured data and cumulative layout shift. The layout shift in this instance could not be bigger than 20% of the page’s height. If it’s greater that 0.2 Google will penelize your website for it. To calculate and visualize the layout shift of your page visit CLS-test.com.

© HTML Lint 2021. All Rights Reserved.

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