Vfrdtyky

Here is an example of how to do it:

a.tip {

    border-bottom: 1px dashed;

    text-decoration: none

}

a.tip:hover {

    cursor: help;

    position: relative

}

a.tip span {

    display: none

}

a.tip:hover span {

    border: #c0c0c0 1px dotted;

    padding: 5px 20px 5px 5px;

    display: block;

    z-index: 100;

    background: url(../images/status-info.png) #f0f0f0 no-repeat 100% 5%;

    left: 0px;

    margin: 10px;

    width: 250px;

    position: absolute;

    top: 10px;

    text-decoration: none

}

<a href="#" class="tip">Link<span>This is the CSS tooltip showing up when you mouse over the link</span></a>

It seems that there is in fact a pure CSS solution, requiring only the css attr expression, generated content and attribute selectors (which suggests that it works as far back as IE8):

a[title]:hover:after {

  content: attr(title);

  position: absolute;

}

Source: https://jsfiddle.net/z42r2vv0/2/

update w/ input from @ViROscar: please note that it's not necessary to use any specific attribute, although I've used the "title" attribute in the example above; actually my recommendation would be to use the "alt" attribute, as there is some chance that the content will be accessible to users unable to benefit from CSS.

update again I'm not changing the code because the "title" attribute has basically come to mean the "tooltip" attribute, and it's probably not a good idea to hide important text inside a field only accessible on hover, but if you're interested in making this text accessible the "aria-label" attribute seems like the best place for it: https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/ARIA_Techniques/Using_the_aria-label_attribute

CSS can't change the tooltip appearance. It is browser/OS-dependent. If you want something different you'll have to use Javascript to generate markup when you hover over the element instead of the default tooltip.

You can't style an actual title attribute

How the text in the title attribute is displayed is defined by the browser and varies from browser to browser. It's not possible for a webpage to apply any style to the tooltip that the browser displays based on the title attribute.

However, you can create something very similar using other attributes.

You can make a pseudo-tooltip with CSS and a custom attribute (e.g. data-title)

For this, I'd use a data-title attribute. data-* attributes are a method to store custom data in DOM elements/HTML. There are multiple ways of accessing them. Importantly, they can be selected by CSS.

Given that you can use CSS to select elements with data-title attributes, you can then use CSS to create :after (or :before) content that contains the value of the attribute using attr().

Styled tooltip Examples

Bigger and with a different background color (per question's request):

[data-title]:hover:after {

    opacity: 1;

    transition: all 0.1s ease 0.5s;

    visibility: visible;

}

[data-title]:after {

    content: attr(data-title);

    background-color: #00FF00;

    color: #111;

    font-size: 150%;

    position: absolute;

    padding: 1px 5px 2px 5px;

    bottom: -1.6em;

    left: 100%;

    white-space: nowrap;

    box-shadow: 1px 1px 3px #222222;

    opacity: 0;

    border: 1px solid #111111;

    z-index: 99999;

    visibility: hidden;

}

[data-title] {

    position: relative;

}

<a href="example.com" data-title="My site"> Link </a> with styled tooltip (bigger and with a different background color, as requested in the question)<br/>

<a href="example.com" title="My site"> Link </a> with normal tooltip

More elaborate styling (adapted from this blog post):

[data-title]:hover:after {

    opacity: 1;

    transition: all 0.1s ease 0.5s;

    visibility: visible;

}

[data-title]:after {

    content: attr(data-title);

    position: absolute;

    bottom: -1.6em;

    left: 100%;

    padding: 4px 4px 4px 8px;

    color: #222;

    white-space: nowrap; 

    -moz-border-radius: 5px; 

    -webkit-border-radius: 5px;  

    border-radius: 5px;  

    -moz-box-shadow: 0px 0px 4px #222;  

    -webkit-box-shadow: 0px 0px 4px #222;  

    box-shadow: 0px 0px 4px #222;  

    background-image: -moz-linear-gradient(top, #f8f8f8, #cccccc);  

    background-image: -webkit-gradient(linear,left top,left bottom,color-stop(0, #f8f8f8),color-stop(1, #cccccc));

    background-image: -webkit-linear-gradient(top, #f8f8f8, #cccccc);  

    background-image: -moz-linear-gradient(top, #f8f8f8, #cccccc);  

    background-image: -ms-linear-gradient(top, #f8f8f8, #cccccc);  

    background-image: -o-linear-gradient(top, #f8f8f8, #cccccc);

    opacity: 0;

    z-index: 99999;

    visibility: hidden;

}

[data-title] {

    position: relative;

}

<a href="example.com" data-title="My site"> Link </a> with styled tooltip<br/>

<a href="example.com" title="My site"> Link </a> with normal tooltip

Known issues

Unlike a real title tooltip, the tooltip produced by the above CSS is not, necessarily, guaranteed to be visible on the page (i.e. it might be outside the visible area). On the other hand, it is guaranteed to be within the current window, which is not the case for an actual tooltip.

^{From the code on the blog post linked above (which I first saw in an answer here that plagiarized it), it appeared obvious to me to use a data-* attribute instead of the title attribute. Doing so was also suggested in a comment by snostorm on that (now deleted) answer.}

I thought i'd post my 20 lines JavaScript solution here. It is not perfect, but may be useful for some depending on what you need from your tooltips.

When to use it

• Automatically styles the tooltip for all HTML elements with a TITLE attribute defined (this includes elements dynamically added to the document in the future)


• No Javascript/HTML changes or hacks required for every tooltip (just the TITLE attribute, semantically clear)


• Very light (adds about 300 bytes gzipped and minified)


• You want only a very basic styleable tooltip

When NOT to use

• Requires jQuery, so do not use if you don't use jQuery


• Bad support for nested elements that both have tooltips


• You need more than one tooltip on the screen at the same time


• You need the tooltip to disappear after some time

The code

// Use a closure to keep vars out of global scope

(function () {

    var ID = "tooltip", CLS_ON = "tooltip_ON", FOLLOW = true,

    DATA = "_tooltip", OFFSET_X = 20, OFFSET_Y = 10,

    showAt = function (e) {

        var ntop = e.pageY + OFFSET_Y, nleft = e.pageX + OFFSET_X;

        $("#" + ID).html($(e.target).data(DATA)).css({

            position: "absolute", top: ntop, left: nleft

        }).show();

    };

    $(document).on("mouseenter", "*[title]", function (e) {

        $(this).data(DATA, $(this).attr("title"));

        $(this).removeAttr("title").addClass(CLS_ON);

        $("<div id='" + ID + "' />").appendTo("body");

        showAt(e);

    });

    $(document).on("mouseleave", "." + CLS_ON, function (e) {

        $(this).attr("title", $(this).data(DATA)).removeClass(CLS_ON);

        $("#" + ID).remove();

    });

    if (FOLLOW) { $(document).on("mousemove", "." + CLS_ON, showAt); }

}());

Paste it anywhere, it should work even when you run this code before the DOM is ready (it just won't show your tooltips until DOM is ready).

Customize

You can change the var declarations on the second line to customize it a bit.

var ID = "tooltip"; // The ID of the styleable tooltip

var CLS_ON = "tooltip_ON"; // Does not matter, make it somewhat unique

var FOLLOW = true; // TRUE to enable mouse following, FALSE to have static tooltips

var DATA = "_tooltip"; // Does not matter, make it somewhat unique

var OFFSET_X = 20, OFFSET_Y = 10; // Tooltip's distance to the cursor

Style

You can now style your tooltips using the following CSS:

#tooltip {

    background: #fff;

    border: 1px solid red;

    padding: 3px 10px;

}

A jsfiddle for custom tooltip pattern is Here

It is based on CSS Positioning and pseduo class selectors

Check MDN docs for cross-browser support of pseudo classes

    <!-- HTML -->

<p>

    <a href="http://www.google.com/" class="tooltip">

    I am a 

        <span> (This website rocks) </span></a>&nbsp; a developer.

</p>



    /*CSS*/

a.tooltip {

    position: relative;

}



a.tooltip span {

    display: none;    

}



a.tooltip:hover span, a.tooltip:focus span {

    display:block;

    position:absolute;

    top:1em;

    left:1.5em;

    padding: 0.2em 0.6em;

    border:1px solid #996633;

    background-color:#FFFF66;

    color:#000;

}

I have found the answer here: http://www.webdesignerdepot.com/2012/11/how-to-create-a-simple-css3-tooltip/

my own code goes like this, I have changed the attribute name, if you maintain the title name for the attribute you end up having two popups for the same text, another change is that my text on hovering displays underneath the exposed text.

.tags {

  display: inline;

  position: relative;

}



.tags:hover:after {

  background: #333;

  background: rgba(0, 0, 0, .8);

  border-radius: 5px;

  bottom: -34px;

  color: #fff;

  content: attr(glose);

  left: 20%;

  padding: 5px 15px;

  position: absolute;

  z-index: 98;

  width: 350px;

}



.tags:hover:before {

  border: solid;

  border-color: #333 transparent;

  border-width: 0 6px 6px 6px;

  bottom: -4px;

  content: "";

  left: 50%;

  position: absolute;

  z-index: 99;

}

<a class="tags" glose="Text shown on hovering">Exposed text</a>

Native tooltip cannot be styled.

That being said, you can use some library that would show styles floating layers when element is being hovered (instead of the native tooltips, and suppress them) requiring little or no code modifications...

You cannot style the default browser tooltip. But you can use javascript to create your own custom HTML tooltips.

a[title="My site"] {

    color: red;

}

This also works with any attribute you want to add for instance:

HTML

<div class="my_class" anything="whatever">My Stuff</div>

CSS

.my_class[anything="whatever"] {

    color: red;

}

See it work at: http://jsfiddle.net/vpYWE/1/