iconmeister.github.io
!!! JSfiddle playground for iconmeister.github.io website
define Custom Element in another Browser window
styling shadowDOM with ::part (shadowParts) in global/host CSS
No-Library (pure JS), HTML, CSS, JavaScript
Using the W3C standard Custom Elements API
parse JSON template+placeholders to shadowRoot innerHTML
slotted
SVG embed IMAGE
load crossOrigin IMG in SVG IMAGE, with mask applied
StackOverflow example, (re)render grid with CSS property --columns