HTML Preview and Validator可以处理什么？
HTML Preview and Validator 用于在浏览器中检查数据，并清楚显示处理结果和限制。 已核对的功能： Sandboxed HTML preview, Duplicate ID detection, Image alt checks, Form-label checks.
Use local preview for fast feedback, Nu for conformance
This page is suited to safe visual inspection and common structural mistakes. It does not claim complete HTML or accessibility validation.
如何使用？
- Paste an HTML document or fragment.
- Choose Preview for sandboxed rendering or Validate structure for deterministic checks.
- Fix reported document, duplicate-ID, image-alt, or form-label issues and rerun.
实际输入输出示例
Find a missing image alternative
输入
<main><img src="photo.jpg"><p>Hello</p></main>输出
Warning: 1 image is missing an alt attribute.The local DOM inspection catches a common accessibility defect without loading a remote validator.
常见错误与修复方法
| 现象 | 可能原因 | 修复方法 |
|---|---|---|
| Scripts do not run in the preview. | The iframe intentionally has a restrictive sandbox. | Use a controlled development environment when script execution is required. |
| No warning appears for a standards issue. | The tool performs focused structural checks, not full conformance validation. | Use the Nu HTML Checker for release-grade standards validation. |
Important behavior of HTML Preview
该工具的实际边界： These deterministic checks are not a substitute for the complete WHATWG conformance rules or the W3C Nu validator.
标准与实现参考
- WHATWG HTML Living Standard (opens in a new tab)Defines HTML parsing and document conformance.
- Nu HTML Checker (opens in a new tab)Provides comprehensive standards-oriented HTML checking.
关于HTML Preview的常见问题
Does the HTML Preview upload my input?
No. Processing runs in the current browser tab, and the page does not send tool input to a KitLumi processing endpoint.
What input does the HTML Preview accept?
It accepts an HTML document or fragment. The workspace checks the input and reports malformed or unsupported values before it produces a result.
What does the HTML Preview produce?
It produces a sandboxed preview and local diagnostics for document, image, ID, and form-label structure. Copy and download controls appear when the output format supports them.
What limitation should I know?
These deterministic checks are not a substitute for the complete WHATWG conformance rules or the W3C Nu validator.
更新记录
本次实质更新： HTML Preview: Added Sandboxed HTML preview, Duplicate ID detection, Image alt checks, Form-label checks, responsive controls, explicit runtime disclosure, and task-specific examples and limitations.