Bundled Themes: use .text() instead .html() for blogname and blogdescription in the Customizer.

[mfields]

Twenty Eleven and Twenty Twelve use the jQuery method .html() in the wp.customize() callback for both blogname and blogdescription. Both of these fields are filtered through esc_html() berfore they are saved to the database. Use of .html() in the Customizer may lead to user confusion when HTML is entered in one of these fields. The HTML will work in the preview but will be rendered as entities after save. Using .text() instead of .html() will show an accurate preview their site for blogname and blogdescription.

In 23429:

Twenty Eleven and Twenty Twelve: use .text() instead of .html() for blogname and blogdescription in Theme Customizer JavaScript handlers. Fixes #23435, props mfields.