One main thing I have been struggling with (for my personal site) is the fact that you can't actually change the shape of the HTML element. Every element is always square shaped. Here is a example of what I mean:

Or another:

What if I actually want to change that element to having a rough edge. Or a triangle. I have been personally struggling with this for my own site. Because I now have to move those blocks into each other while styling the element as a certain shape. Wouldn't it make much more sense if those elements can just be fitted into each other like building blocks. Here is my example:

As you can see the element has a margin to where it goes into the other element, because they are square. It is styled as a triangle using polygon or svg for example. But the second example shows both HTML elements as a triangle perfectly next to each other.

This may be redundant but it will save having to think of weird ways of piecing blocks together.