Author Archives: Mark DuBois

When working with CSS, we have all experienced using various units (such as em or px). Can you provide me a complete list of all valid CSS units. Yes, all valid ones. First to provide this wins bragging rights and … Continue reading →

For my puzzler this month, I pose this challenge… When developing a website to display on mobile devices (as well as the desktop),we often use media queries. What if… your client doesn’t want you to use media queries. Are there … Continue reading →

The spring semester starts this week. I thought it might be appropriate to review a simple error which I see all too often. In this case, I am working with an experimental feature in CSS called CSS grids. I would … Continue reading →

This is one that happens from time to time. Yes, there is a simple explanation. I have seen this in source code as well as on web pages created by students. Why does the symbol � show up in a … Continue reading →

Ok, this is a pretty simple one (but often represents the sorts of problems I encounter from students). Here is the result I seek: However, I don’t seem to be able to get this working. It seems to be mostly … Continue reading →

Here are a few acronyms. I am curious if you know what these stand for? Please place your answers in the comments. These are all related to web design and development. First one to include a comment with all correct … Continue reading →

If you think it is easy teaching HTML, CSS and related web technologies… Let’s see how long it takes you to figure out these puzzlers. I plan to provide one periodically. Keep in mind these are real problems that students … Continue reading →