title: _source_alt
---
summary: The alt from the source of the record.
---
type: sysfield
---
body:

This field points to the true source [Alternative
:ref](../../../../content/alts/) of the page.  This primarily exists internally
to support the builder.  In particular the difference to the `_alt` field is
that this one will indicate if an alt falls back to a different alternative.
At present pages can only fall back to the `_primary` alternative which will
be reflected by this field.

## Example

```html+jinja
<!-- generated from language {{ this._source_alt }} -->
```