How to Style a Title? (And with CSS or Js)

Is it possible to style a title? (and with CSS or js?)

You can put newlines in your title attribute via HTML entities to force a line break in the text. Most browsers these days support this. This is the only change you can make to the native tooltip display of the browser.

<a href="real_link" title="check
this
out">foo bar</a>

See the above example on a web page.

As others have pointed out, there exist a large number of plugins for various JS libraries for making custom HTML tooltips which are styleable. Here is the top hit for the Google search "jquery tooltip plugin", reviewing 10 such plugins.

styling title tag in the head with css or js

The browser allows JS to give the page dynamic behaviour, but changing the font of a window belongs to the OS.
The tab, instead is controlled by the browser but it doesn't interact with the page.

Can we set style to title tag in header

You can apply CSS to the <title> element, but not though the style attribute (since it is for "All elements but BASE, BASEFONT, HEAD, HTML, META, PARAM, SCRIPT, STYLE, TITLE").

I'm not aware of any browser that will apply CSS for the rendering of the title in browser tabs or title bars though.

You can, however, do something like:

head { display: block; }
title { display: block; font-size: 200%; font-weight: bold; }

how to apply style to 'title' attribute of 'td' tag

Not directly.

You can do it with:

JavaScript code: see here
a library: see here
a little workaround with CSS see here

Styling HTML Title attribute using CSS

You can do a custom solution using CSS3.

Take a look at How to change the style of Title attribute inside the anchor tag?. But might I suggest that you use a custom field like 'data-title' so the default browser behaviour doesn't interfere with your custom solution.

How do you change the style of the Title tag in css?

You don't. The title tag is not formatted text. If JavaScript is an option you can use: document.title = document.title.toUpperCase();