Hi, I heard about my friend told me about that there's a CSS Specifications that you should always fit the width if this code was created for an iframe , that means no one should be using bootstrap or other libraries, is that correct?https://ibb.co/ke9s0a
It's impossible to really understand what you're asking, since all you're providing is a crappy paint-sketch, and not a very clear question. But there is one truth in there: noone should use Bootstrap, that is very correct.
Could you repeat that in ENGLISH? It's near impossible to tell what it is you are asking, though you used two terms -- iframe and bootcrap -- that REALLY should be avoided on websites. IFRAMES were deprecated twenty years ago for a REASON and SHOULD have no business on websites if not for the continued shortcomings of browser makers failing to make OBJECT do what it was supposed to, as well as a number of cross-site development issues JavaScript still hasn't properly addressed. Bootcrap is a fat bloated steaming pile of manure that only halfwits who don't know enough about HTML or CSS to be making websites in the first damned place are DUMB ENOUGH to use. But as to how that relates to your drawing of squiggly lines, buggered if I know.