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<!DOCTYPE html>
<html class="test-wait">
<title>HTML Canvas test: SVG filter using CSS font-relative line-height units</title>
<link rel="match" href="svg-filter-lh-rlh-expected.html"/>
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<style>
:root {
font: 20px Ahem;
}
</style>
<svg width="0" height="0">
<!-- https://html.spec.whatwg.org/multipage/canvas.html#working-with-externally-defined-svg-filters -->
<use href="./svg-filter.svg#filter-lh" />
<use href="./svg-filter.svg#filter-rlh" />
</svg
><canvas id="canvas-lh" width="100" height="100"></canvas><br
><canvas id="canvas-rlh" width="100" height="100"></canvas>
<script>
function use_filter(canvas, filter_id) {
const ctx = canvas.getContext("2d");
ctx.font = "40px Ahem";
ctx.filter = `url(./svg-filter.svg#${filter_id})`;
ctx.fillStyle = "red";
ctx.fillRect(0, 0, 100, 100);
}
window.addEventListener("load", async () => {
use_filter(document.getElementById("canvas-lh"), "filter-lh");
use_filter(document.getElementById("canvas-rlh"), "filter-rlh");
document.documentElement.classList.remove('test-wait');
});
</script>
</html>
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