To ensure that the HTML code complies with the standards can be achieved in four ways: 1. Use online verification tools such as W3C Markup Validation Service to quickly check for errors and prompt HTTPS support; 2. Install HTML verification plug-in in the IDE to achieve real-time feedback and custom rules; 3. Use command line tools html-validate or tidy for automated batch verification and integrate with CI/CD; 4. Pay attention to hidden problems such as case mixing, label not closed, etc., and maintain good coding habits to improve compatibility and SEO performance.

In web development, it is very important to ensure that HTML code complies with standards. It not only improves the compatibility of pages in different browsers, but also allows search engines to better crawl content. To achieve this, HTML standardized verification tools and techniques are required.

1. Use the online HTML verification tool

The easiest way is to use online HTML verification services, such as W3C's official Markup Validation Service . This type of tool can quickly check whether your HTML code complies with the standards and indicate errors or warning messages.

• Enter the web address, or paste the code directly
• It will list all places that do not comply with the specification, including label not closed, attribute writing errors, etc.
• Especially suitable for beginners or scenarios where problems need to be quickly investigated

It should be noted that some online tools do not fully support HTTPS. If your website has SSL enabled, it is recommended to choose a verification platform that supports HTTPS.

2. Integrated Development Environment (IDE) Plug-in

If you are used to writing code locally, you can install the HTML verification plugin in a commonly used editor. For example, install "HTMLHint" or "IntelliSense for CSS class names in HTML" in VS Code, which can prompt questions in real time as you write your code.

The benefits of these plugins are:

• Real-time feedback, write and check errors
• Supports custom rules, such as whether certain tags or attributes are allowed
• Reduce problems that are discovered before going online

However, the accuracy of the plugin depends on configuration and version updates, and it is recommended to check the plugin settings regularly to ensure the latest HTML standard rules are used.

3. Automatic verification of command line tools

For team collaboration or continuous integration processes, automated verification is more efficient using command-line tools. Tools like html-validate or tidy can be embedded in the build process, ensuring that the HTML submitted is verified.

For example, you can run a simple check like this:

 npx html-validate index.html

The advantages of this approach are:

• Multiple files can be processed in batches
• Can be combined with CI/CD process to automatically intercept unqualified code submissions
• More flexible and supports scripted processing

But this also requires developers to have some experience in command line operation and be able to understand the output log information.

4. Pay attention to hidden FAQs

Some HTML problems are not easy to detect, such as mixed case use, extra spaces, wrong nested structures, etc. While these won't cause a complete crash on the page, they may affect performance or SEO.

For example, the following writing method is prone to problems:

 <div><p>Some text</div>

The <p></p> tag is not closed correctly here, which may cause rendering exceptions.

It is recommended to maintain good formatting habits when writing code, such as consistent indentation and clear label pairing, so that problems can be discovered even without the help of tools.

Basically these are the methods. HTML verification doesn't seem complicated, but it's easy to ignore. Mastering a few practical tools and adding a little good habits can lead to cleaner, standard code.

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