fix "Contexts in which this element can be used:" of <header> and <footer> element

[mtrootyy]

https://w3c.github.io/html/sections.html#the-header-element

Contexts in which this element can be used:

• Where flow content is expected.

↓
The above should be fixed following;

Contexts in which this element can be used:

• Where flow content is expected, but with no address, dt, or th element ancestors, or header, footer elements that are not ancestors of sectioning content which is a ancestors of the header.

https://w3c.github.io/html/sections.html#the-footer-element

Contexts in which this element can be used:

• Where flow content is expected.

↓
The above should be fixed following;

Contexts in which this element can be used:

• Where flow content is expected, but with no address, dt, or th element ancestors, or header, footer elements that are not ancestors of sectioning content which is a ancestors of the footer.

　
　
　
Ref: https://w3c.github.io/html/grouping-content.html#the-address-element

Content model:

• Flow content, but with no heading content descendants, no sectioning content descendants, and no main, header, footer, or address element descendants.

Ref: https://w3c.github.io/html/grouping-content.html#the-dt-element

Content model:

• Flow content, but with no header, footer, sectioning content, or heading content descendants.

Ref: https://w3c.github.io/html/tabular-data.html#the-th-element

Content model:

• Flow content, but with no header, footer, main, sectioning content, or heading content descendants.

Ref: https://w3c.github.io/html/sections.html#the-header-element

Content model:

• Flow content, but with no main element descendants, or header, footer elements that are not descendants of sectioning content which is a descendant of the header.

Ref: https://w3c.github.io/html/sections.html#the-footer-element

Content model:

• Flow content, but with no main element descendants, or header, footer elements that are not descendants of sectioning content which is a descendant of the footer.

[carolgilabert]

I can look into this 🙋‍♀️

[siusin]

Thanks all.

We're closing this issue on the W3C HTML specification because the W3C and WHATWG are now working together on HTML, and all issues are being discussed on the WHATWG repository.

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