Source

Imagines

Documenta et exempla pro imaginibus optandi in mores dociles (ita numquam majores elementis parentium fiunt) ac levia genera illis addunt - omnia per classes.

Responsiva imagines

Imagines in Bootstrap fiunt responsivae cum .img-fluid. max-width: 100%;et height: auto;ad imaginem applicatur ut elementum parentis trutinat.

Placeholder Responsive image 
<img src="..." class="img-fluid" alt="Responsive image">
imagines SVG et IE 10

In Penitus Rimor 10, SVG imagines cum .img-fluidproportione sunt magnitudines. Hoc ut figas, adde width: 100% \9;ubi necesse est. Hoc improprie fige magnitudines alias formas imaginum, ideo Bootstrap non statim eam applicat.

Image ailnthubms

Praeter ad utilitates nostrae radiophonicae , uti potes .img-thumbnailimaginem dare 1px rotundi speciem.

A generic square placeholder image with a white border around it, making it resemble a photograph taken with an old instant camera 200x200 
<img src="..." alt="..." class="img-thumbnail">

Imagines aligning

Conlineare imagines cum adiutorio float classes or text alignment classes . block-level imagines sitas esse potest utens in .mx-automargine utilitate classis .

Placeholder 200x200 Placeholder 200x200 
<img src="..." class="rounded float-left" alt="...">
<img src="..." class="rounded float-right" alt="...">
Placeholder 200x200 
<img src="..." class="rounded mx-auto d-block" alt="...">
Placeholder 200x200 
<div class="text-center">
  <img src="..." class="rounded" alt="...">
</div>

Picture

Si <picture>elementum uteris ad multa <source>elementa specifica pro specifica <img>, fac .img-*classibus addere <img>et non <picture>tag.

<picture>
  <source srcset="..." type="image/svg+xml">
  <img src="..." class="img-fluid img-thumbnail" alt="...">
</picture>