For icons I prefer Unicode characters, which are text already built into the OS and made available by the browser. There is nothing to download. Some of these

For icons I prefer Unicode characters, which are text already built into the OS and made available by the browser. There is nothing to download. Some of these icons are colorful graphics. Like SVGs they are always vectors that can be scaled with CSS. Animated graphics are nice only as a substitution for text content when text content should be eliminated or is not available. One example is waiting for data from a remote computer, such as a spinner. Another example is waiting on CPU time at the local computer, such as building or compiling something. A third example is a software defect that blocks the display of requested text content.