2.1.133 [W3C-HTML51] Section 10.3.7 Sections and headings

  • Article

V0427: No nesting rules for sections and headings are defined

The specification states:

 10.3.7 Sections and headings
     ...
     article, aside, h1, h2, h3, h4, h5, h6, nav, section {
         display: block;
     }
  
     h1 { margin-top: 0.67em; margin-bottom: 0.67em; font-size: 2.00em; font-weight: bold; 
     }
     h2 { margin-top: 0.83em; margin-bottom: 0.83em; font-size: 1.50em; font-weight: bold; 
     }
     h3 { margin-top: 1.00em; margin-bottom: 1.00em; font-size: 1.17em; font-weight: bold; 
     }
     h4 { margin-top: 1.33em; margin-bottom: 1.33em; font-size: 1.00em; font-weight: bold; 
     }
     h5 { margin-top: 1.67em; margin-bottom: 1.67em; font-size: 0.83em; font-weight: bold; 
     }
     h6 { margin-top: 2.33em; margin-bottom: 2.33em; font-size: 0.67em; font-weight: bold; 
     }
  
     In the following CSS block, x is shorthand for the following selector: 
     :matches(article, aside, nav, section)
     ...
     x h1 { margin-top: 0.83em; margin-bottom: 0.83em; font-size: 1.50em; }
     x x h1 { margin-top: 1.00em; margin-bottom: 1.00em; font-size: 1.17em; }
     x x x h1 { margin-top: 1.33em; margin-bottom: 1.33em; font-size: 1.00em; }
     x x x x h1 { margin-top: 1.67em; margin-bottom: 1.67em; font-size: 0.83em; }
     x x x x x h1 { margin-top: 2.33em; margin-bottom: 2.33em; font-size: 0.67em; }

EdgeHTML Mode

No nesting rules for sections and headings are defined.