This course platform uses iframes. An iframe is an embedded HTML document within the main HTML document. It’s a page within a page.
When you resize the partition between code and preview, you’re resizing the embedded document. The media query runs in the context of that inner page.
The
<strong>HTML tag is meant to convey that an element is critically important or urgent, like “Warning: Product may explode if shaken”.
font-weight, meanwhile, isn’t so opinionated. It can be used whenever we want to sprinkle some visual prominence in. For example, headings often use bolded text, even though they aren’t (usually) urgent or dire.
Originally, the default value for line-height property was
1, but it’s ticked up over the years: in Chrome, the new default value is1.15. In Firefox, it’s1.2.