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There is another good method to get this done by using pointer-events:

.child {
    opacity: 0;
    pointer-events: none;

    -webkit-transition: opacity 0.5s ease-in-out;
    -moz-transition: opacity 0.5s ease-in-out;
    transition: opacity 0.5s ease-in-out;
}

.parent:hover .child {
    opacity: 0.9;
    pointer-events: all;
}

Unfortunately, this is not supported in <= IE10.

There is another good method to get this done by using pointer-events:

.child {
    opacity: 0;
    pointer-events: none;

    -webkit-transition: opacity 0.5s ease-in-out;
    -moz-transition: opacity 0.5s ease-in-out;
    transition: opacity 0.5s ease-in-out;
}

.parent:hover .child {
    opacity: 0.9;
    pointer-events: all;
}

Unfortunately, this is not supported in IE10 and below.

This post is old, but there is another good method to get this done by using pointer-events:

.child {
    opacity: 0;
    pointer-events: none;

    -webkit-transition: opacity 0.5s ease-in-out;
    -moz-transition: opacity 0.5s ease-in-out;
    transition: opacity 0.5s ease-in-out;
}

.parent:hover .child {
    opacity: 0.9;
    pointer-events: all;
}

But unfortunately this is not supported in IE until v11.

There is another good method to get this done by using pointer-events:

.child {
    opacity: 0;
    pointer-events: none;

    -webkit-transition: opacity 0.5s ease-in-out;
    -moz-transition: opacity 0.5s ease-in-out;
    transition: opacity 0.5s ease-in-out;
}

.parent:hover .child {
    opacity: 0.9;
    pointer-events: all;
}

Unfortunately, this is not supported in <= IE10.

This post is old, but there is another good method to get this done by using pointer-events:

.child {
    opacity: 0;
    pointer-events: none;

    -webkit-transition: opacity 0.5s ease-in-out;
    -moz-transition: opacity 0.5s ease-in-out;
    transition: opacity 0.5s ease-in-out;
}

.parent:hover .child {
    opacity: 0.9;
    pointer-events: all;
}

This post is old, but there is another good method to get this done by using pointer-events:

.child {
    opacity: 0;
    pointer-events: none;

    -webkit-transition: opacity 0.5s ease-in-out;
    -moz-transition: opacity 0.5s ease-in-out;
    transition: opacity 0.5s ease-in-out;
}

.parent:hover .child {
    opacity: 0.9;
    pointer-events: all;
}

But unfortunately this is not supported in IE until v11.