title: What's the difference between the layout_alignStart tag and layout_alignLeft?
body: <p>I'm developping an Android application and I used the <a href="http://developer.android.com/reference/android/widget/RelativeLayout.LayoutParams.html#attr_android:layout_alignStart" rel="nofollow noreferrer">layout_alignStart</a> tag. It worked well, until I tested my app on an older device. I then realized that layout_alignStart was only supported in api 17. </p>
  
  <p>Reading the documentation, it made sense to replace all these layout_alignStart by layout_alignLeft. </p>
  
  <p>However, I want to know what's the actual difference between these two tags?</p>