You can add clientWidth, clientHeight, offsetWidth and offsetHeight bindings to any element:
App
<div bind:clientWidth={w} bind:clientHeight={h}>
<span style="font-size: {size}px" contenteditable>{text}</span>
<span class="size">{w} x {h}px</span>
</div>These bindings are readonly — changing the values of w and h won’t have any effect on the element.
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<script>
let w = $state();
let h = $state();
let size = $state(42);
</script>
<label>
<input type="range" bind:value={size} min="10" max="100" /> font size ({size}px)</label>
<div>
<span style="font-size: {size}px" contenteditable>edit this text
</span>
<span class="size">{w} x {h}px</span></div>
<style>
div {position: relative;
display: inline-block;
padding: 0.5rem;
background: hsla(15, 100%, 50%, 0.1);
border: 1px solid hsl(15, 100%, 50%);
}
.size {position: absolute;
right: -1px;
bottom: -1.4em;
line-height: 1;
background: hsl(15, 100%, 50%);
color: white;
padding: 0.2em 0.5em;
white-space: pre;
}
</style>