Svg Lineargradient Hidden If Svg Is Hidden In Seperate Class

Basically what Is happening is the linearGradient fill is hidden if the svg is hidden in a parallell element as you can see in the snippet above, the SVG element is there, the lin

Solution 1:

Either consider a different ID for the gradients:

.mobile {
  display: none;
}

.content-svg {
  border: 1px solid black;
}

<divclass="desktop"><!-- stuff here --></div><divclass="mobile"><svgclass="mobile-svg"height="150"width="400"><defs><linearGradientid="grad1"x1="0%"y1="0%"x2="100%"y2="0%"><stopoffset="0%"style="stop-color:rgb(255,255,0);stop-opacity:1" /><stopoffset="100%"style="stop-color:rgb(255,0,0);stop-opacity:1" /></linearGradient></defs><ellipsecx="200"cy="70"rx="85"ry="55"fill="url(#grad1)" />
  Sorry, your browser does not support inline SVG.
  </svg></div><divclass="content"><svgclass="content-svg"height="150"width="400"><defs><linearGradientid="grad2"x1="0%"y1="0%"x2="100%"y2="0%"><stopoffset="0%"style="stop-color:rgb(255,255,0);stop-opacity:1" /><stopoffset="100%"style="stop-color:rgb(255,0,0);stop-opacity:1" /></linearGradient></defs><ellipsecx="200"cy="70"rx="85"ry="55"fill="url(#grad2)" />
  Sorry, your browser does not support inline SVG.
  </svg></div>

Or consider only one gradient if it's the same used in both SVG (related: Gradients hidden using SVG symbols)

.mobile {
  display: none;
}

.content-svg {
  border: 1px solid black;
}

<divclass="desktop"><!-- stuff here --></div><svgheight="0"width="0"><defs><linearGradientid="grad1"x1="0%"y1="0%"x2="100%"y2="0%"><stopoffset="0%"style="stop-color:rgb(255,255,0);stop-opacity:1" /><stopoffset="100%"style="stop-color:rgb(255,0,0);stop-opacity:1" /></linearGradient></defs></svg><divclass="mobile"><svgclass="mobile-svg"height="150"width="400"><ellipsecx="200"cy="70"rx="85"ry="55"fill="url(#grad1)" />
  Sorry, your browser does not support inline SVG.
  </svg></div><divclass="content"><svgclass="content-svg"height="150"width="400"><ellipsecx="200"cy="70"rx="85"ry="55"fill="url(#grad1)" />
  Sorry, your browser does not support inline SVG.
  </svg></div>

---

Repeating the same ID is invalid and only the first one will be considered for both gradients and since the first one has display:none it will not render.

Changing the order will make your code work because the first one will no more have display:none

.mobile {
  display: none;
}

.content-svg {
  border: 1px solid black;
}

<divclass="desktop"><!-- stuff here --></div><divclass="content"><svgclass="content-svg"height="150"width="400"><defs><linearGradientid="grad1"x1="0%"y1="0%"x2="100%"y2="0%"><stopoffset="0%"style="stop-color:rgb(255,255,0);stop-opacity:1" /><stopoffset="100%"style="stop-color:rgb(255,0,0);stop-opacity:1" /></linearGradient></defs><ellipsecx="200"cy="70"rx="85"ry="55"fill="url(#grad1)" />
  Sorry, your browser does not support inline SVG.
  </svg></div><divclass="mobile"><svgclass="mobile-svg"height="150"width="400"><defs><linearGradientid="grad1"x1="0%"y1="0%"x2="100%"y2="0%"><stopoffset="0%"style="stop-color:rgb(255,255,0);stop-opacity:1" /><stopoffset="100%"style="stop-color:rgb(255,0,0);stop-opacity:1" /></linearGradient></defs><ellipsecx="200"cy="70"rx="85"ry="55"fill="url(#grad1)" />
  Sorry, your browser does not support inline SVG.
  </svg></div>