Use SVG icon as marker in OpenLayers

To me, the solution was:

const iconMarkerStyle = new ol.style.Icon({
    src: './data/static_images/marker.svg',
    //size: [100, 100],
    offset: [0, 0],
    opacity: 1,
    scale: 0.35,
    //color: [10, 98, 240, 1]
})

Then add size parameters directly in the SVG file:

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 144.81 215.81" width="14.5px" height="21.6px">
    <title>Asset 190-SVG</title>
</svg>

Here is an example that shows inline SVG in an icon symbolizer: http://jsfiddle.net/eze84su3/

Here is the relevant code:

var svg = '<svg width="120" height="120" version="1.1" xmlns="http://www.w3.org/2000/svg">'
    + '<circle cx="60" cy="60" r="60"/>'
    + '</svg>';

var style = new ol.style.Style({
  image: new ol.style.Icon({
    opacity: 1,
    src: 'data:image/svg+xml;utf8,' + svg,
    scale: 0.3
  })
});

A few differences from yours:

• I added width and height attributes to the <svg>. This lets the browser know how big to make the resulting image.
• I added a scale property to the icon to resize the image.
• I used utf8 instead of base64 encoding (not significant).