Another HTML-lint 5 is a free checker for HTML syntax. You may freely reuse and repost this as long as it is for non-profits. Please make sure to link to this website and specify explicitly your (website manager's) location and contact details. Advertising or any service associated with advertising is forbidden. Please see FAQ("I want to use Another HTML-lint 5 for commercial purpose") for commercial use.
Note: This is currently Beta version. Please contact us at the following e-mail if you find any problems.
Email support@heartcore.co.jp
Recent Updates
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| 2023/6/2 | Fixed false-positive problems about HTML5 nesting. |
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| 2023/4/19 | Fixed false-positive problems in the value of "id" attribute. |
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| 2023/2/28 | Fixed problems that could not be verified by URL. |
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| 2017/12/6 | Added support for https site validation. |
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| 2017/3/7 | Fixed false-positive problems with "main" element. |
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| 2017/3/7 | Fixed false-positive problems with "dt" element. |
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| 2016/7/14 | Fixed false-positive problems with "colgroup" element. |
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| 2016/3/23 | Added new Accessibility Check functionality. |
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| 2016/3/23 | Added support for HTML5 "main" element. |
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| 2016/3/23 | Fixed false-positive problems with "rel" and "src" attributes. |
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| 2016/3/23 | Added support for "tabindex" attribute negative interger values. |
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| 2016/3/23 | Fixed false-positive problems with "media" attribute. |
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| 2016/3/23 | Fixed HTML anchor link problem. |
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| 2014/4/10 | Added support for "stylesheet" and "alternate" values specified together for rel attribute. |
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| 2013/11/5 | Duplicate id is now detected as an error for HTML5 DOCTYPE. |
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| 2013/6/21 | The use of "<" or ">" is no longer detected as an error for HTML5 DOCTYPE. |
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| 2013/5/14 | Added support for "canonical" value used with rel attribute. |
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| 2013/1/11 | <text> tags used with Inline SVG are now supported for HTML5. |
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| 2012/12/5 | Escaped tags inside <script> tag are no longer detected as an error. |
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| 2012/12/5 | Anchors defined with ID attribute are no longer detected as an error except in HTML4.0. |
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| 2012/1/12 | We support WAI-ARIA, role attribute and aria-* attribute in HTML5. |
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| 2012/1/12 | We support Microdata, itemscope attribute in HTML5. | |
| 2012/1/12 | We suuport Mathml element and SVG element in HTML5. | |
| 2012/1/12 | We support style element, scoped attribute in HTML5. | |
| 2012/1/12 | We support meta element, http-equiv attribute in HTML5. | |
| 2012/1/12 | We support sub-lang attribute in META element in HTML5. | |
| 2011/10/1 | Added support for HTML5 and started service. | |
