Fix #685

Remove test: "should have sans-serif font family" in html section.
The font-size declaration in html tag was removed and this test fails.

Remove opinionated pre overflow

…d from form elements.

This normalizes the CSS to what the suggested default browser CSS should
be, which is now implemented in IE11, Edge, Blink, WebKit and Gecko (for
the latter, see https://www.w3.org/Bugs/Public/show_bug.cgi?id=28784)

References twbs/bootstrap#17379

Closes #471

Use a test-like presentation to make it clearer what the test file is
looking to test. Don't use the file as a dumping ground for every HTML
element. This change makes the tests more focused and useful.

Fix gh-276
Fix gh-284
Fix gh-285

Ref gh-102

Inherit all `font` properties.

Inherit `color` for form controls. Chrome and Safari on OS X will not
inherit `color` as they heavily restrict the author-defined styles that
will be respected for that element.

Fix gh-157

Fixes an issue in Firefox [1] and Chrome [2]. The implicit width of
`fieldset` can be determined by the width of descendants rather than the
parent container. This change (adding `min-width:0`) makes the
`fieldset` behave like a `div` in this regard.

[1] https://bugzilla.mozilla.org/show_bug.cgi?id=504622
[2] http://stackoverflow.com/questions/8084343/google-chrome-fieldset-overflow-bug

Close #272

The `template` element shipped in Firefox 22 and Chrome 26. Browsers
without HTML template support should at least hide the element.

Switch from placekitten.com to lorempixel.com for placeholder images.