有时候，有时候，你并不指定具体要渲染哪个元素, 与其写个长长的{#if...}：

Sometimes you don’t know in advance which element needs to be rendered. Rather than having a long list of {#if ...} blocks...

{#if selected === 'h1'}
	<h1>I'm a <code>&lt;h1&gt;</code> element</h1>
{:else}
	<p>TODO others</p>
{/if}

不如索性来个<svelte:element>：

...we can use <svelte:element>:

<svelte:element this={selected}>
	I'm a <code>&lt;{selected}&gt;</code> element
</svelte:element>

this的值可以是任意的字符串，如果是个false那就不渲染了。

The this value can be any string, or a falsy value — if it’s falsy, no element is rendered.