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When rendering both EJ1 and EJ2 controls with help of compatibility CSS, EJ1 controls get affected by EJ2 styles.
EJ1 Sample: https://stackblitz.com/edit/ej1-inputs?file=index.html
EJ1 and EJ2 sample: https://stackblitz.com/edit/ej1-ej2-inputs?file=index.html