Invalid html files in the repository

```xmllint``` fails to validate htmls. For example:
```
$ xmllint --html specs/2.0.0/index.html > /dev/null
specs/2.0.0/index.html:80: HTML parser error : Unexpected end tag : a

^
specs/2.0.0/index.html:85: HTML parser error : Unexpected end tag : a
WebGL 1.0 specification. It will only describe the differences from 1.0.
^
specs/2.0.0/index.html:234: element a: validity error : ID CONTEXT_CREATION already defined

The Drawing Buffer

^
specs/2.0.0/index.html:1943: HTML parser error : Unexpected end tag : dt

^
specs/2.0.0/index.html:1965: HTML parser error : Unexpected end tag : dt

^
specs/2.0.0/index.html:1988: HTML parser error : Unexpected end tag : dt

^
specs/2.0.0/index.html:2010: HTML parser error : Unexpected end tag : dt

^
specs/2.0.0/index.html:2317: HTML parser error : Unexpected end tag : p

^
specs/2.0.0/index.html:2541: HTML parser error : Unexpected end tag : p

^
specs/2.0.0/index.html:2630: HTML parser error : Unexpected end tag : p

^
specs/2.0.0/index.html:3086: HTML parser error : Unexpected end tag : p
_ATTACHMENT nor STENCIL_ATTACHMENT has an image attached.

^
specs/2.0.0/index.html:3449: HTML parser error : Unexpected end tag : code
waitSync takes GLint64 values instead of
^
specs/2.0.0/index.html:3449: HTML parser error : Unexpected end tag : code
tSync takes GLint64 values instead of GLuint64
^
specs/2.0.0/index.html:3778: HTML parser error : Unexpected end tag : image

^
specs/2.0.0/index.html:3791: HTML parser error : Unexpected end tag : p

^
specs/2.0.0/index.html:3801: HTML parser error : Unexpected end tag : p

^
specs/2.0.0/index.html:3829: HTML parser error : Unexpected end tag : code
xoffset, yoffset, width, and height.
^
```

```specs/2.0.0/index.html:80``` indicates that links are embedded, which is meaningless in html.