There are web-based generators for almost everything; stripes, buttons, forms, loader icons, etc. CSS Arrow Please focuses on another niche; yes, totally CSS-based (no images) arrows. This CSS trick is great for using in tooltips, the generator offers multiple options for customization (the position, color and border values) and auto-creates the related CSS code.

A very short introduction - by Bartek Szopka

A demonstration of what can be accomplished with only 1 K (Kibibyte) of CSS. Select any design from the list to load it into this page.

Cross-Browser CSS in Seconds.

when a browser draws the borders, it draws them at angles. This technique takes advantage of that. One side of the border is colored for the color of the arrow, and the rest are transparent. Then you set the width of the border to something large

Keeping track of Mozilla development is never easy, especially the minute details related to new or improved web technology development and support. The Mozilla development community has set up a new weblog to fix this, the Web Tech weblog. Here the devs will be posting about and discussing topics of interest to web developers.