Angular 4 enable HTML5 validation - html

Question

I want to use HTML5 validation in Angular 4 rather than their form's based validation/reactive validation. I want to keep the validation running in the browser.
It used to work in Angular 2, but since I've upgraded, I can't get even manually created forms without any angular directives to validate using HTML5.
For instance, this won't validate in the browser at all:
<form>
<h2>Phone Number Validation</h2>
<label for="phonenum">Phone Number (format: xxxx-xxx-xxxx):</label><br />
<input id="phonenum" type="tel" pattern="^\d{4}-\d{3}-\d{4}$" required>
<input type="submit" value="Submit">
</form>

Answer 1

Angular4 automatically adds a novalidate attribute to forms.
To override this, you can add the ngNativeValidate directive to the form.
<form ngNativeValidate>
<h2>Phone Number Validation</h2>
<label for="phonenum">Phone Number (format: xxxx-xxx-xxxx):</label><br />
<input id="phonenum" type="tel" pattern="^\d{4}-\d{3}-\d{4}$" required>
<input type="submit" value="Submit">
</form>
Unfortunately I do not see this reflected in the docs yet, but found it by looking at the source code:
https://github.com/angular/angular/blob/master/packages/forms/src/directives/ng_no_validate_directive.ts
It appears also adding ngNoForm to the form has the same effect as ngNativeValidate depending on your use-cases for needing to declare something as not a form for whatever reason.
Hope this helps.

Answer 2

use ngNoForm or ngNativeValidate in your form
<form ngNoForm/ngNativeValidate>
...
</form>