Just like Superman has flying, super-strength and X-Ray vision, the Web Developers have a superpower of their own, much like Batman's amazing toolbelt. This superpower is the browser console.
At work (and most of the times at home), I have at least one tab with the developer's console open. Besides the mandatory debugging required by my job, it's often a very helpful tool.
Much like other people can open up a command prompt, type
I rarely use the default calculator nowadays, most of the time I just type the whole expression and wait for it to return the result
You can even declare variables (or constants, for that matter) and reuse them for later calculatios. You wouldn't want to write a program each time for a throwaway result, used only once, would you?
But the coolest part is the fact you can manipulate the web pages you see.
I once ran into some great S.F. stories, by writters like Asimov or Arthur C. Clarke, published on bare-bones simple web pages, usually a standard .html page, with the text / paragraphs inside tables.
On my big screen monitor, the fullwidth text was difficult to read on a single, giant column, especially since I'm used to reading on the smaller Kindle screen. Modern sites, like Medium, also keep the content on a slimmer, centered column.
With a web console, that's not a problem. You just start inspecting the element and fiddle with the code and CSS settings until you reach a font, width and size combination that fits your needs.
This is how Asimov's Last Question looks like by default:
...and this is how it looks after a few lines of CSS:
Much better, I dare say.