arpansinghchauhan

I have checked this behavior on w3schools site http://www.w3schools.com/tags/tryit.asp?filename=tryhtml_fieldset Can you please tell me why fieldset border is disappearing in landscape mode ? Device used: iPhone 6 Plus.

I am working on the responsive part of my website, and in iPhone 6 plus, fieldset borders are missing(both portrait and landscape mode). I checked fieldset elements on other responsive site(w3schools) on iPhone 6 plus, In portrait mode i can see border but it disappears in landscape mode. For all the devices (iPhone and iPad): fieldset border disappear, as soon as I zoom in. If I remove legend, border will appear again (in all the cases). Please provide some pointers