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@ngdoc error
@name $compile:tplrt
@fullName Invalid Template Root
@description
When a directive is declared with `template` (or `templateUrl`) and `replace` mode on, the template
must have exactly one root element. That is, the text of the template property or the content
referenced by the templateUrl must be contained within a single html element.
For example, `<p>blah <em>blah</em> blah</p>` instead of simply `blah <em>blah</em> blah`.
Otherwise, the replacement operation would result in a single element (the directive) being replaced
with multiple elements or nodes, which is unsupported and not commonly needed in practice.
For example a directive with definition:
```
myModule.directive('myDirective', function factory() {
return {
...
replace: true,
templateUrl: 'someUrl'
...
}
});
```
And a template provided at URL `someUrl`. The template must be an html fragment that has only a
single root element, like the `div` element in this template:
```
<div><b>Hello</b> World!</div>
```
An an invalid template to be used with this directive is one that defines multiple root nodes or
elements. For example:
```
<b>Hello</b> World!
```
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