Use the **[`title`][1]** attribute while `alt` is important for SEO stuff.


  [1]: http://www.w3schools.com/tags/att_global_title.asp

The simplest way to get tooltips in most browsers is to set some text in the [title attribute][1].

eg.

    &lt;img src=&quot;myimage.jpg&quot; alt=&quot;a cat&quot; title=&quot;My cat sat on a table&quot; /&gt;

produces (hover your mouse over the image):

![a cat][2]


Title attributes can be applied to most HTML elements.


  [1]: http://www.w3schools.com/tags/att_global_title.asp
  [2]: http://www.imagechicken.com/uploads/1275939952008633500.jpg &quot;My cat sat on a table&quot;

The [`title` attribute][1] works on most HTML tags and is widely supported by modern browsers.


  [1]: http://www.w3schools.com/tags/att_global_title.asp

How do I check if a file is empty in C#?

I need something like:

    if (file is empty)
    {
        // do stuff
    }
    
    else
    {
        // do other stuff
    }

Is file empty check

While reading some papers about the Turing completeness of recurrent neural nets (for example: Turing computability with neural nets, Hava T. Siegelmann and Eduardo D. Sontag, 1991), I got the feeling that the proof which was given there was not really that practical. For example the referenced paper needs a neural network which neuron activity must be of infinity exactness (to reliable represent any rational number). Other proofs need a neural network of infinite size. Clearly, that is not really that practical.

But I started to wonder now if it does make sense at all to ask for Turing completeness. By the strict definition, no computer system nowadays is Turing complete because none of them will be able to simulate the infinite tape.

Interestingly, programming language specification leaves it most often open if they are turing complete or not. It all boils down to the question if they will always be able to allocate more memory and if the function call stack size is infinite. Most specification don&#39;t really specify this. Of course all available implementations are limited here, so all practical implementations of programming languages are not Turing complete.

So, what you can say is that all computer systems are just equally powerful as finite state machines and not more.

And that brings me to the question: **How useful is the term Turing complete at all?**

And back to neural nets: For any practical implementation of a neural net (including our own brain), they will not be able to represent an infinite number of states, i.e. by the strict definition of Turing completeness, they are not Turing complete. **So does the question if neural nets are Turing complete make sense at all?**

The question if they are as powerful as finite state machines was answered already much earlier (1954 by Minsky, the answer of course: yes) and also seems easier to answer. I.e., at least in theory, that was already the proof that they are as powerful as any computer.

---

Some other questions which are more about what I really want to know:

* Is there any theoretical term which can say something more specific about the computational power of a computer? (given its limited memory space)

* How can you compare the computational power of practical implementations of neural nets with computers? (Turing-completeness is not useful as argumented above.)


How useful is Turing completeness? are neural nets turing complete?

I am displaying 5 `userImage` on one screen.I want to display `userID` and  `email` on `mouseover` on those userImage.I used `alt` property of image control but that not working in mozila,chrome and some versions of IE.
So what are the other better ways to display info on mouseover?

how can I display tooltip or item information on mouse over?

<p>I am displaying 5 <code>userImage</code> on one screen.I want to display <code>userID</code> and  <code>email</code> on <code>mouseover</code> on those userImage.I used <code>alt</code> property of image control but that not working in mozila,chrome and some versions of IE.
So what are the other better ways to display info on mouseover?</p>


I have two div elements side by side. I&#39;d like the height of them to be the same, and stay the same if one of them resizes. If one grows because text is placed into it, the other one should grow to match the height. I can&#39;t figure this one out though. Any ideas?

&lt;!-- begin snippet: js hide: false console: true babel: false --&gt;

&lt;!-- language: lang-html --&gt;

    &lt;div style=&quot;overflow: hidden&quot;&gt;
        &lt;div style=&quot;
            border: 1px solid #cccccc;
            float: left;
            padding-bottom: 1000px;
            margin-bottom: -1000px;
        &quot;&gt;
            Some content!&lt;br /&gt;
            Some content!&lt;br /&gt;
            Some content!&lt;br /&gt;
            Some content!&lt;br /&gt;
            Some content!&lt;br /&gt;
        &lt;/div&gt;

        &lt;div style=&quot;
            border: 1px solid #cccccc;
            float: left;
            padding-bottom: 1000px;
            margin-bottom: -1000px;
        &quot;&gt;
            Some content!
        &lt;/div&gt;
    &lt;/div&gt;

&lt;!-- end snippet --&gt;


How do I keep two side-by-side div elements the same height?

Within my web application I am using some custom validation for my form fields. Within the same form I have two buttons: one to actually submit the form and the other to cancel/reset the form.

Mostly I use Safari as my default browser. Now Safari 5 is out and suddenly my cancel/reset button didn&#39;t work anymore. Every time I did hit the reset button the first field in my form did get the focus. However this is the same behavior as my custom form validation. When trying it with another browser everything just worked fine. I had to be a Safari 5 problem.

I changed a bit in my Javascript code and I found out that the following line was causing the problem:

    document.getElementById(&quot;somefield&quot;).required = true;

To be sure that would be really the problem I created a test scenario:

	&lt;!DOCTYPE html&gt;
	&lt;html&gt;
	&lt;head&gt;
		&lt;title&gt;Test&lt;/title&gt;
	&lt;/head&gt;
	
	&lt;body&gt;
		&lt;form id=&quot;someform&quot;&gt;
			&lt;label&gt;Name:&lt;/label&gt;&amp;nbsp;&lt;input type=&quot;text&quot; id=&quot;name&quot; required=&quot;true&quot; /&gt;&lt;br/&gt;
			&lt;label&gt;Car:&lt;/label&gt;&amp;nbsp;&lt;input type=&quot;text&quot; id=&quot;car&quot; required=&quot;true&quot; /&gt;&lt;br/&gt;
			&lt;br/&gt;
			&lt;input type=&quot;submit&quot; id=&quot;btnsubmit&quot; value=&quot;Submit!&quot; /&gt;
		&lt;/form&gt;
	&lt;/body&gt;
	&lt;/html&gt;

What I expected would happen did happen. The first field &quot;name&quot; did get the focus automatically.

Anyone else stumbled into this?

Required attribute HTML5

I&#39;m writing some javascript (a greasemonkey/userscript) that will insert some input fields into a form on a website.

The thing is, I don&#39;t want those input fields to affect the form in any way, I don&#39;t want them to be submitted when the form is submitted, I only want my javascript to have access to their values.

Is there some way I could add some input fields into the middle of a form and not have them submitted when the form is submitted?

Obviously the ideal thing would be for the input fields to not be in the form element, but I want the layout of my resulting page to have my inserted input fields appear between elements of the original form.

Stop an input field in a form from being submitted

Some [HTML][1]&lt;sup&gt;1&lt;/sup&gt; closing tags are *optional*, i.e.:

    &lt;/HTML&gt;
    &lt;/HEAD&gt;
    &lt;/BODY&gt;
    &lt;/P&gt;
    &lt;/DT&gt;
    &lt;/DD&gt;
    &lt;/LI&gt;
    &lt;/OPTION&gt;
    &lt;/THEAD&gt;
    &lt;/TH&gt;
    &lt;/TBODY&gt;
    &lt;/TR&gt;
    &lt;/TD&gt;
    &lt;/TFOOT&gt;
    &lt;/COLGROUP&gt;

**Note:** Not to be confused with closing tags that are **forbidden** to be included, i.e.:

    &lt;/IMG&gt;
    &lt;/INPUT&gt;
    &lt;/BR&gt;
    &lt;/HR&gt;
    &lt;/FRAME&gt;
    &lt;/AREA&gt;
    &lt;/BASE&gt;
    &lt;/BASEFONT&gt;
    &lt;/COL&gt;
    &lt;/ISINDEX&gt;
    &lt;/LINK&gt;
    &lt;/META&gt;
    &lt;/PARAM&gt;

**Note:** `xhtml` is different from HTML. xhtml is a form of xml, which requires *every* element have a closing tag. A closing tag can be **forbidden** in html, yet **mandatory** in `xhtml`.


Are the optional closing tags  

 - ideally *included*, but we&#39;ll accept them if you forgot them, or
 - ideally *not* included, but we&#39;ll accept them if you put them in

In other words, *should* I include them, or should I *not* include them?

The [HTML 4.01 spec talks about closing element tags being optional][2], but doesn&#39;t say if it&#39;s preferable to include them, or preferable to not include them.

On the other hand, [a random article on DevGuru says][3]:

&gt; The ending tag is optional. However, it is recommended that it be included. 

The reason I ask is because you just *know* it&#39;s optional for compatibility reasons; and they would have made them (**mandatory** | **forbidden**) if they could have.

Put it another way: What did HTML 1, 2, 3 do with regards to these, now optional, closing tags. What does HTML 5 do? And what should *I* do?

Note
------
Some elements in HTML are *forbidden* from having closing tags. You may disagree with that, but that is the specification, and it&#39;s not up for debate. I&#39;m asking about *optional* closing tags, and what the intention was.


Footnotes
---------

&lt;sup&gt;1&lt;/sup&gt;HTML 4.01


  [1]: http://www.w3.org/TR/REC-html40/index/elements.html
  [2]: http://www.w3.org/TR/html401/intro/sgmltut.html#didx-element-3
  [3]: http://www.devguru.com/technologies/html/quickref/html_td.html

HTML: Include, or exclude, optional closing tags?

Without any extension library, is it possible to have multiple layers in the same canvas element?

So if I do a clearRect on the top layer, it will not erase the bottom one?

Thanks.


html5 - canvas element - Multiple layers

I have some websites I built times ago, that use jquery mouse events...I just got an ipad and i noticed that all the mouse over events are translated in clicks...so for instance i have to do two clicks instead of one..(the first hover, than the actual click)

is there a workaround ready to solve this? maybe a jquery command i shoudl have used instead of mouseover/out etc..
thanks!

iPad/iPhone hover problem causes the user to double click a link

My problem is that in WPF, whenever I try and change the colour of a button&#39;s background using triggers or animations, the default mouseover effect (of being grey with that orange glow) seems to take priority.

After extensive searches I&#39;m clueless as to how to remove this effect.

How to remove default mouse-over effect on WPF buttons?

I am looking to take an icon that is colored (and will be a link) and turn it greyscale until the user places their mouse over the icon (where it would then color the image).

Is this possible to do, and in a way that is IE &amp; Firefox supported?

Image Greyscale with CSS &amp; re-color on mouse-over?

I&#39;m trying to disable the window mouse scroll functionality when the mouse is hovering over the div - so that only div scrolling is enabled - and when mouse moves away from the div - scrolling to the window is applied again. The div is positioned absolutely.

I&#39;ve seen this post [use jquery to disable mouse scroll wheel function when the mouse cursor is inside a div?][1] but it doesn&#39;t seem to provide any answer - hence my question.

I&#39;m assuming it would be something like this (if only these methods existed):

    $(&#39;#container&#39;).hover(function() {
	     $(window).scroll().disable();
	     $(this).scroll().enable();
    }, function() {
	     $(window).scroll().enable();
    });


  [1]: https://stackoverflow.com/q/5236633/464709

jQuery disable scroll when mouse over an absolute div

I have scoured stackoverflow and other forums including the google maps v3 api docs for an answer but I cannot find how to change the event that fires the marker info window from *click* to *mouseover* in the files I am working with. 

I am working with a demo from the google library that includes a fusion table layer.

You zoom into the clusters and see the small red circle markers for locations.
You have to click to reveal an info window. I wish to rollover to reveal the info window.

My demo is here:
&lt;http://www.pretravelvideo.com/gmap2/&gt;

The functions.js file does most of the work here:
&lt;http://www.pretravelvideo.com/gmap2/functions.js&gt;


Content Type	Original Author	Original Content on Stackoverflow
Question	nectar	View Question on Stackoverflow
Solution 1 - Html	Sarfraz	View Answer on Stackoverflow
Solution 2 - Html	adrianbanks	View Answer on Stackoverflow
Solution 3 - Html	Asaph	View Answer on Stackoverflow

how can I display tooltip or item information on mouse over?

Html Problem Overview

Html Solutions

Solution 1 - Html

Solution 2 - Html

Solution 3 - Html

How useful is Turing completeness? are neural nets turing complete?

Is file empty check

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