When creating a webpage, I carefully consider the arrangement of elements and how they come together to form a cohesive layout. If elements need to be aligned closely like books on a shelf, I use floats to snugly position them next to each other. However, if the elements are more loosely placed like scattered post-it notes on a desk, I opt for absolute positioning as the relationship between each element's placement is not as important.
I take into account the varying sizes of elements and their dynamic content. When dealing with elements that vary in size due to content differences, using floats helps maintain a structured alignment. It can get challenging when positioning elements of unpredictable sizes because it may lead to breaking the layout or concealing content unexpectedly beyond the container's boundaries.
In some cases, it may be necessary to combine both float and absolute positioning techniques depending on the specific requirements of the web design project.