WordPress 的主題特色
https://codex.WordPress.org/Theme_Features
Theme Features is a set of features defined by theme authors that allows a theme to register support of a certain feature. Theme support functions should be called in the theme's functions.php file to work.
WordPress 主題特色是在主題的 function.php 里加上一些函式來支援一些特色功能。
比如：
WordPress 的主題特色列表：
Content Width
Automatic Feed Links
Custom Backgrounds
Custom Headers
Post Thumbnails
Post Formats
Title Tag
Editor Style
Theme Markup
Sidebars
Navigation Menus
-------------------