Let Win8's fixed website have high-quality visual effects.

Microsoft's fixed website in Win8 describes how web developers can provide a website icon (favicon) for their website's fixed website tile on Windows 8's "Start" screen. . Many developers have provided the same feedback, hoping to provide a higher resolution visual effect to better display the website brand through the user's fixed website tile. Microsoft specifically responded to the IE official blog:
Examples
Below are two examples of fixed website tiles that use the website's favicon to automatically determine the color (left) and use a custom tile color. To determine the high resolution PNG (right):



The Meta tag specifies the image and background color of the tile. Example:
<meta name="msapplication-TileImage" content="images/benthepcguy-144.png"/>
<meta name="msapplication-TileColor" content="#d83434"/> ;
The tile image must be a square PNG with a length of 144px and a width of 144px. For best results, it is recommended to use a transparent background instead of the background color that matches the color of the tile. You can specify the tile color as a hexadecimal RGB color using CSS's #rrggbb notation (via CSS color name or via CSS rgb() function).
Note: When users pin the site to their Start screen, IE10 only downloads tile images to ensure that the site does not incur additional broadband consumption.