Slot basics (default slot) in Svelte - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a default slot in Svelte?

A default slot is a placeholder inside a Svelte component where you can insert any child content when you use that component. If no content is provided, the slot remains empty or shows fallback content.

beginner

How do you define a default slot in a Svelte component?

You add the <slot></slot> tag inside your component's markup. This tag marks where the passed child content will appear.

beginner

What happens if you use a component with a default slot but don't pass any content inside it?

The slot will be empty unless you provide fallback content inside the <slot> tag. Fallback content is shown only when no child content is passed.

beginner

Why are slots useful in Svelte components?

Slots let you create flexible components that can wrap or decorate any content you want. This helps reuse layout or style while letting users decide what content to show inside.

beginner

Show a simple example of a Svelte component using a default slot.

Example:<br><pre>&lt;!-- Box.svelte --&gt;
&lt;div class="box"&gt;
  &lt;slot&gt;Default content here&lt;/slot&gt;
&lt;/div&gt;</pre><br>Usage:<br><pre>&lt;Box&gt;Hello!&lt;/Box&gt;</pre><br>This will render a div with class box containing "Hello!".

What tag do you use to create a default slot in a Svelte component?

A <slot></slot>

B <content></content>

C <insert></insert>

D <child></child>

The correct tag for slots in Svelte is .

If no content is passed to a default slot, what will be shown?

A The component does not render

B An error is thrown

C The slot shows the last passed content

D The slot shows fallback content if provided

Slots can have fallback content inside the tag that shows when no content is passed.

Why use slots in Svelte components?

A To allow flexible content inside reusable components

B To style components with CSS

C To fetch data from APIs

D To create animations

Slots let you insert any child content inside a component, making it flexible and reusable.

How do you pass content to a default slot when using a component?

A Use a special attribute

B Use a separate slot component

C Place the content between the component tags

D You cannot pass content to default slots

Content placed between the component's opening and closing tags fills the default slot.

What will this render?<br>

<Box></Box>

<br>Given <slot>Hello</slot> inside Box.svelte?

A An empty box

B A box with the text 'Hello'

C An error

D Nothing renders

Since no content is passed, the fallback 'Hello' inside the slot is shown.

Explain what a default slot is in Svelte and how it works.

Think about how you can insert content inside a reusable box.

Describe a simple example of using a default slot in a Svelte component and how to pass content to it.

Imagine wrapping some text inside a custom box component.