Setting the default escaper group from within a template

Normally, the default escaper group for a template is inferred from the file's extension.

For cases where the file extension doesn't correlate to the contents of the file (e.g., using .oxip instead of .html.oxip), the default group can be set within a template:

{% default_escaper_group html %}
<h1 title="{{ attr: title }}">{{ title }}</h1>

But when the escaper group is inferred incorrectly from the file extension (e.g., .tmpl is set to html by default), the default group has to be replaced instead:

{% replace_escaper_group json %}
{
    "greeting": "Hello {{ name }}!",
}