# HTML
HTML block is used to integrate custom UI, CSS styles, external scrips (like Spotify, GitHub, analytics, etc.).
**Important:** HTML block is working only on the page it is placed. If you open and close the page, the HTML block is inserted each time. If you need to use some global scripts which executed once per application launch, you should use [custom script](/tgtaps-docs/features/head-scripts.md).
## Example 1: custom div block
## Example 2: iFrame
You can integrate iFrame into HTML. Keep in mind: you should place HTML block into [a container](/tgtaps-docs/blocks/basic/quickstart.md) with full screen height and select 100% height for HTML block:
Let's take an example:
The iFrame code is:
```
```
The result is:
***
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