These properties have been implemented in Firefox, Chrome and Safari.
In addition, the CSS WG has just resolved to move the spec to CR.

Spec: https://drafts.csswg.org/css-align/#property-index

Closes #4739

The property is defined in this spec:
https://drafts.csswg.org/css-ui/#caret-color

It has been recently implemented on Chromium and Firefox.

Issue #4735

Issue #4724

Issue #4733

Issue #4726

Closes #4725

To avoid false negatives due to window scrolling

Avoid duplicates for #4719

I broke this in 0ad53e0a. Closes #4713.

The URL for the official blog has changed
Also, there has been a terminology change in the Blogger interface, now 'template' has been replaced by 'theme'

Issue #4712

Issue #4710

Closes #4707

The original character class `[^\\\[\\]]` escapes `\\` instead of `\]`
(e.g. it would be the character class `[^\\\[]` followed by a `]`
which I think is wrong).

Closes #4701

Issue #4622