Redmine

The attached patch updates the colors of Markdown "Warning" and "Caution" alerts. It changes "Warning" to use orange and "Caution" to use yellow, so that their colors match the usual meaning of these terms and align with safety sign standards such as ISO 3864 and ANSI Z535.

Currently, the Markdown alert boxes in Redmine use yellow for "Warning" and red for "Caution." However, in general usage, "warning" indicates a higher level of risk than "caution." Using yellow for "Warning" and red for "Caution" therefore feels inverted and counterintuitive.

According to the international safety sign standard ISO 3864, the risk levels are defined in the order of "DANGER" (red), "WARNING" (orange), and "CAUTION" (yellow). This means that "WARNING" represents a higher risk than "CAUTION," and colors such as red or orange correspond to higher danger levels than yellow. The ANSI Z535 standard follows the same convention, defining "WARNING" as orange and "CAUTION" as yellow.

GitHub's Markdown alerts, on the other hand, use a yellowish-brown color for "Warning" and red for "Caution." Redmine's current color scheme appears to have been inspired by this design. GitLab, however, does the opposite: it uses red for "Warning" and a yellowish tone for "Caution," assigning the stronger color to the more serious term.

For Redmine, it would be clearer and more consistent with both international standards and common expectations if "Warning" used orange and "Caution" used yellow. This adjustment would align the color hierarchy with the actual levels of risk and make Markdown content easier to understand at a glance. Because Redmine is a general-purpose tool used across many industries, following widely recognized conventions and standards would help ensure a more intuitive experience for all users.

Current colors:

Updated colors: