How Do I Change Styles Of Title. And Made It On Text Click Appear Title Of Any Tag In Html

There is no clear idea is given on the scenario on which you want a scenario, but still i have tried to give one solution as per my understanding of your question.

What i understand you have a title and you wan to appear a style for the title on click of it, and after 5 seconds it will disappear automatically.
So let say your title is a span with ID = 'spanTitle' as below :

<span id="spanTitle">Sample Title</span>

We have a css class which will apply font style as you want like below :-

.headerStyle{
    font-weight:bold;
    color:red;    
}

Now here is the jQuery code which will set the style for it on click of it, also it will automatically be normal after 5 secs.
Ex :-

$(document).ready(function(){
    $('#spanTitle').click(function(){
        $('#spanTitle').addClass('headerStyle');
        setTimeout(function(){change_style();},5000);
    });    
});

function change_style(){
    $('#spanTitle').removeClass('headerStyle');
}

Hope this is the exact solution what you are looking for and what i understood your question, if not can you please elaborate your question a bit more ?