I have 2 file :
1.htm
<iframe name="name1" id="id1" src="frame.htm"></iframe>

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frame.htm
<input type="checkbox" name="checkItem" id="checkItem_" value="linh">

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I want to create a checkbox in 1.htm file ( write code only in 1.htm, don't write in frame.htm)
Then I will click to checkbox in 1.htm
then the checkbox in frame.htm will checked ?
Help me!
Thanks everyone !!!!