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Description
Simple optimize command can result in markers being removed:
svgo -i input.svg -o output.svg
Input file:
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100">
<style>
.line {
fill: none;
stroke: #f00;
stroke-width: 4px;
marker-end: url(#arrow);
}
#arrow {}
</style>
<defs>
<marker id="arrow" class="arrow" overflow="visible" markerHeight="1" markerWidth="1" orient="auto-start-reverse" preserveAspectRatio="xMidYMid" viewBox="0 0 1 1">
<path d="M-3-3 0 0l-3 3"/>
</marker>
</defs>
<path d="M 0 50 H 100" class="line"/>
</svg>Output file:
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><path d="M0 50h100" style="fill:none;stroke:red;stroke-width:4px;marker-end:url(#arrow)"/></svg>Note that the arrow marker is missing in the output.
In the input file, if #arrow {} is either removed or changed to .arrow {}, the problem doesn't occur.
SVGO 3.3.2
Node 20.10.0