prueba con picture

src/lib/Slider.svelte

@@ -2,11 +2,16 @@
 
 <div class="slider">
   <div class="slider-image">
-    <img  srcset=" slider01-test-500w.jpg 768w,
-                  slider01-test-1108w.jpg 1140w"
-          sizes=" (max-width: 768px) 768px,
-                  1140px"
-          src="slider01-test-1108w.jpg" alt="Jóvenes manifestándose" >
+    <picture>
+      <source srcset="slider01-test-500w.jpg" media="(max-width: 768px)">
+      <source srcset="slider01-test-1108w.jpg">
+      <img srcset="slider01-test-1108w.jpg" alt="Jóvenes manifestándose">
+    </picture>
+    <!-- <img  srcset="slider01-test-500w.jpg 500w,
+                  slider01-test-1108w.jpg 1108w"
+          sizes=" (max-width: 768px) 500px,
+                  1108px"
+          src="slider01-test-1108w.jpg" alt="Jóvenes manifestándose" > -->
   </div>
   <div class="slider-content">
     <div class="slider-title">