Cannot update Windows with error C80003F9

Clearing the SoftwareDistribution folder fixed it.  Steps here.
Essentially:  stop the Windows Update service, then rename the SoftwareDistribution folder under %windir%, and then restart the Windows Update service.

Ways to escape an XML string in C#

Different ways how to escape an XML string in C#

See #3:  System.Security.SecurityElement.Escape()

Notes on querying metadata in SharePoint 2013

CAML Query with Managed Metadata (quote):

Just use the field as you would any lookup, basing your query on the display value, not the ID. SharePoint will support any types of queries you can on a text field, such as equals, contains or begins with. So you can even enter just a couple of characters and receive search results! Something like this works great:
<where>
<contains>
<fieldref name="ManagedMetadata">
<value type="TaxonomyFieldType">My Value</value>
</fieldref>
</contains>
</where>


Managed MetaData “ampersand” values

• Managed MetaData “ampersand” values (termset)
• SharePoint 2010: Managed Metadata Converts Ampersand and Double Quotes to Unicode

Essentially, this works:
<Eq>
<FieldRef Name='MyTaxonomyField' />
<Value Type='TaxonomyFieldType'>Science \uFF06 Technology</Value>
</Eq>


Safari or iOS8 breaks SharePoint 2010 site

The solution was the Safarifix.browser mentioned here plus the note about compat.moss.browser mentioned at the bottom of this post.

Adding custom styles on the SharePoint 2013 ribbon

New Custom Styles and new bulleted styles to SharePoint 2013 Rich Text Editor

Dropdowns with autocomplete and synonyms

The Redesigned Country Selector:

'The technically correct term for this would be something like an “auto-complete text field with loose partial matching, synonyms and weighted results.”'

Font units relative to viewport

Whoa!  Did not know (or had forgotten) that CSS3 has font units that are relative to the viewport.  See:

• Font scaling based on width of container
• Viewport Percentage Units
• Support stats
• Viewport Sized Typography at CSS-Tricks