try ssc out Paste an HTML snippet, review the options, & Submit. no <STYLE> CSS 1 CSS 2.0 CSS 2.1 CSS 2.2 (draft) CSS 2007 Snapshot CSS 2010 Snapshot CSS 2015 core Snapshot CSS 2015 wibbly Snapshot CSS 2015 wibbly–wobbly Snapshot CSS 2017 core Snapshot CSS 2017 wibbly Snapshot CSS 2017 wibbly–wobbly Snapshot CSS 2018 core Snapshot CSS 2018 wibbly Snapshot CSS 2018 wibbly–wobbly Snapshot CSS 2020 core Snapshot CSS 2020 wibbly Snapshot CSS 2020 wibbly–wobbly Snapshot CSS 2021 core Snapshot CSS 2021 wibbly Snapshot CSS 2021 wibbly–wobbly Snapshot CSS 2022 core Snapshot CSS 2022 wibbly Snapshot CSS 2022 wibbly–wobbly Snapshot CSS 2023 core Snapshot CSS 2023 wibbly Snapshot CSS 2023 wibbly–wobbly Snapshot All CSS level 3 modules All CSS levels 3 & 4 modules All CSS levels 3, 4 & 5 modules All CSS modules HTML Tags (draft) HTML 1.0 (draft) HTML + (draft) HTML 2 HTML 3.0 (draft) HTML 3.2 HTML 4.0 HTML 4.01 HTML 5.0 HTML 5.1 HTML 5.2 HTML 5.3 (draft) HTML 5 Living Standard July 2007 HTML 5 Living Standard January 2008 HTML 5 Living Standard July 2008 HTML 5 Living Standard January 2009 HTML 5 Living Standard July 2009 HTML 5 Living Standard January 2010 HTML 5 Living Standard July 2010 HTML 5 Living Standard January 2011 HTML 5 Living Standard July 2011 HTML 5 Living Standard January 2012 HTML 5 Living Standard July 2012 HTML 5 Living Standard January 2013 HTML 5 Living Standard July 2013 HTML 5 Living Standard January 2014 HTML 5 Living Standard July 2014 HTML 5 Living Standard January 2015 HTML 5 Living Standard July 2015 HTML 5 Living Standard January 2016 HTML 5 Living Standard July 2016 HTML 5 Living Standard January 2017 HTML 5 Living Standard July 2017 HTML 5 Living Standard January 2018 HTML 5 Living Standard July 2018 HTML 5 Living Standard January 2019 HTML 5 Living Standard July 2019 HTML 5 Living Standard January 2020 HTML 5 Living Standard July 2020 HTML 5 Living Standard January 2021 HTML 5 Living Standard April 2021 HTML 5 Living Standard July 2021 HTML 5 Living Standard October 2021 HTML 5 Living Standard January 2022 HTML 5 Living Standard April 2022 HTML 5 Living Standard July 2022 HTML 5 Living Standard October 2022 HTML 5 Living Standard January 2023 HTML 5 Living Standard April 2023 HTML 5 Living Standard July 2023 HTML 5 Living Standard October 2023 HTML 5 Living Standard January 2024 HTML 5 Living Standard April 2024 WebApps January 2005 WebApps July 2005 WebApps January 2006 WebApps July 2006 WebApps January 2007 XHTML 1.0 XHTML 1.1 core XHTML 2.0 XHTML 5.0 XHTML 5.1 XHTML 5.2 XHTML 5.3 (draft) no <MATH> MathML 1 MathML 2 MathML 3 MathML 4 MathML 4 core no <SVG> SVG 1.0 SVG 1.1 SVG 1.2 SVG 1.2/full (draft) SVG 2.0 SVG 2.1 (draft) Catastrophic Errors only Abhorrent Errors & worse All Errors Errors & Warnings only Errors, Warnings, & Information Everything Check spelling Slovenly HTML Ignore old Internet Explorer idiosyncrasies Ignore old Safari idiosyncrasies Verify Microformats Verify ontologies Reset Submit Dylan Harris November 2024