Form

A <form> that tells its fields how to validate, and gives them the errors of the server.

<script>
  import Button from '@brumate/ui/Button.brm';
  import FieldError from '@brumate/ui/FieldError.brm';
  import Form from '@brumate/ui/Form.brm';
  import Input from '@brumate/ui/Input.brm';
  import Label from '@brumate/ui/Label.brm';
  import TextField from '@brumate/ui/TextField.brm';
</script>

<Form class="ui-form" validationErrors=({ email: 'This email has an account' })>
  <TextField class="ui-field" name="email" type="email" value="ada@example.com">
    <Label>Email</Label>
    <Input class="ui-input" />
    <FieldError class="ui-error" />
  </TextField>
  <Button type="submit" class="ui-button">Sign up</Button>
</Form>

validationBehavior is the default of its fields. See Validation.
validationErrors holds errors by the name of a field, such as { email: 'This email has an account' }. A field shows them until the user edits it.
It takes the attributes of a <form>, such as action, so it posts without scripts.