Deep Nesting: supports borders

• [svay.com FR] [EN]
• [alistapart.com] Part I - uses tags you may or may not already have in your markup
• [alistapart.com] Part II - suitable for transparent backgrounds
• [sovavsiti.cz] uses many nested divs.
• [sperling.com] simple box by tedd.

Top and bottom group of divs or spans: supports borders

• [Spiffy Corners] Css based rounded corners
• [redmelon.net] supports borders and corners
• [johnp.co.nz]
• [mrclay.org]
• [456bereastreet.com]
• [hardgrok.org] generates images using PHP
• [jimdabell.com]
• [francky's LiquidCorners EN/NL] css-only, 1 small gif, supports also transparency and home made borders

Sliding doors: better for smaller boxes

This technique was inspired by Douglas Bowmann's [ALA] article [Sliding Doors of CSS].

• [rounded corners] supports borders and corners
• [vertexwerks.com] simple, semantic XHTML, supports borders and corners
• [andreas-kalt.de]

Change the border color with CSS, no image change.

This technique was inspired by Roger Johansson's [Teaser Boxes] and Maurice Svay [Nested <div> technique].

• [ischagast.nl NL] (Broken, 2007-01-26)

IMG tags inside a div:

• [kalsey.com] uses very simple HTML and CSS code. Doesn't require lots of nested Divs. Limited to solid area fill and doesn't do borders.

Only IMG tags: single pixel borders only

• [albin.net] supports current browsers, but uses hacks extensively

-moz-border-radius: Mozilla only

• [clagnut.com] shows how to use Mozilla's extensions for rounded corners. (Note that the Mozilla extensions do not conform to the CSS3 border module)

Generated content: beautiful

• [virtuelvis.com] - Very simple HTML, though requires generated content support. Works in Moz, Opera, Safari 1.1 and degrades gracefully in IE.

Scripted - very clean HTML

• [Nifty Corners] Rounded corners without images :: Alessandro Fulciniti, first version (16 Mar. 2005)
• [More Nifty Corners] :: Alessandro Fulciniti, second version (06 Apr. 2005). Works in IE 5.5 and later, Opera 7.5 and later, Gecko af Firefox 1.0 level, and Safari 1.1.
• [Nifty Corners Cube] :: Alessandro Fulciniti, final version (27 Apr. 2006)
• [Transparent custom corners and borders]
• [Gradient Corners] Gradient backgrounds with rounded corners. Works in IE 5. and later, Firefox 1.5, and Safari 2.0. (Untested in other browsers.)
• [RuzeeBorders] Anti-aliased corners, drop shadows, different border widths. Works on all modern browsers, even Opera and Konqueror.

Free Online Web Tools

• [CSS2 Round Corner Generator (Beta)] Just type in the square color and the background color and click the "Enviar" button to generate your custom round corners.

Commercial Tools

• [ WellRounded DreamWeaver Extension] Supports custom foreground and background colors, borders, drop shadows and inner shadows. Creates graphics and insert CSS and XHTML 1.1 valid markup into the current DreamWeaver document. The containers support relative dynamic positioning, size-to-content. Tutorials provided for using the WellRounded containers as columns, nesting, etc.

Clean Markup - No Javascript

• [Spanky Corners] No extra DIVs or Javascript required. Doesn't support nesting, or IE5. Requires a minimum HTML structure (DIV, Header, Content). CSS and Images autogenerated by a tool.