## a header in a wrapper
a palceholder in a wrapper:
```js
const placeholder = html`
`
display(placeholder)
display("width generator on wrapper element:")
display(content_width)
```
**If I edit anything inside the wrapper div, the reactive width is set to 0**
```js
placeholder; // force order dependency
document.getElementById('placeholder').textContent = "hello";
```
```js
const content_width = Generators.width(document.getElementById("wrapper"));
```