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How to design alert box in HTML

It shows me a simple Alert Box when I use this
<button onclick="alert('AlertBox')">Click Me</button>
But is their any way to have an alert box, with extra bg color and some extra effect look?

use Sweet Alert
Or Make div with fixed position display none, and in javascript when you click on botton change div display to block

Here is the detailed example of Designed Alert Box with help of Sweet Alerts
http://javainfinite.com/html/custom-designed-alerts/

The javascript alert() is a system message box that will will block your page whilst it displays and will look different on different operating systems.
What you are looking for is usually referred to as a dialog box or modal popup, these are constructed using html and javascript to look like the page behind is blocked or greyed out.
If you are starting out, you could look at some examples like:
https://www.w3schools.com/howto/howto_css_modals.asp
These are build from scratch.
Or you could look at using a css librarly like BootStrap which will have these components and other components to help style your website or application.
eg: https://getbootstrap.com/docs/4.3/components/modal/

Create Zooming Box

I'm trying to create a website and I've been trying to create something which will open new content when clicked on, somewhat like Facebook has on the pictures: You click, Get a window with the picture and text area for commenting. I'm specifically trying to avoid popups because I don't find them very neat.
Does anybody know how i could create this/ have any tutorials? Is this extremely complex?

Have a look at jquery ui:
http://jqueryui.com/demos/dialog/

You can not avoid a popup. The only difference is that using a javascript framework like jquery you can have a beautiful popup.
So use the jquery dialog box to display the image and textbox for commenting. Using ajax you can save the comment and exit the dialog box. The trick is to make good use of css and opacity on the dialog box.

Link in Javascript alert

I want to put a link in a Javascript alert.
Is this possible? (I've searching for a solution, but I keep getting things about links that fire alerts!)

AFAIK you can't do that with a normal javascript alert box.
Make a custom alert box and then make a link inside it.
Here is a nice one
YUI: Dialog Alert Widget
Also a jQuery based one
jQuery Impromptu

Nope. Only standard OS dialog boxes are available (alert, input, etc.), and none support embedded hyperlinks.
You can could a pop-up window that is styled to look like a dialog, but pop-up windows are likely to have various user blocks, etc. in place.
My advice is to use a an absolutely-positioned DIV with a high z-order centered on your page that looks like a dialog box and put whatever you want in it. Various UI toolkits like JQuery UI take the pain out of this.

Looking for particular alert box behavior

I'm interested in alert boxes such as,
http://www.visual-blast.com/javascript/nice-alert-box-with-jquery-impromptu/
and
http://woork.blogspot.com/2008/08/design-stunning-alert-box-using.html
but with a different functionality, the user should be able to interact with the page even with the alert box present, so it needs to be movable and not obscure the underlying page, as in this example,
http://www.open-lab.com/mb.ideas/index.html
Alert box should be generated automatically on page view plus the title and message of the alert box should change with each page refresh from expandable library.
Is there anything out there like this?
Thanks

Sounds like the jQuery UI dialog widget might do what you need?
http://jqueryui.com/demos/dialog/

Here is an example with mootools. You easily can extend any element on the page to be draggable. You may use this plugin as a sample of alerts and you'll just need to remove some functionality and add make it draggable.

There are few custom dialogs in moo.rd. One of them is the Custom.Alert:
http://www.moord.it/examples/custom_alert

javascript message box

I want to display an error message on my asp.net application. This message is a warning message, this is the way I did it:
CmdCalcInvoke.Attributes["onclick"] = "return confirm('Are you sure you want to calculate the certification? WARNING: If the quarter has not finished, all the partners status will change')";
The code above works fine. The CmdCalcInvoke is an htmlInputButton. This is the message that the message box displays;
Are you sure you want to calculate the certification? WARNING: If the quarter has not finished, all the partners status will change
What I want to do is to display this message, but wanted to highlight the WARNING word by making it bold, or displaying the word in red, can this be done???, can't remember seeing a message box with this characteristics, but I though i would ask in case
Any suggestions will be welcome

you can if you dont use the default alert boxes. Try using a javascript modal window which is just normal div markup that you can control the styling of. Look at blockui for jquery (there are loads of others)

You can try something like: http://weblogs.asp.net/johnkatsiotis/archive/2008/09/14/asp-net-messagebox-server-and-client.aspx

The modal dialog control I use is :
http://foohack.com/tests/vertical-align/dialog.html
http://foohack.com/2007/11/css-modal-dialog-that-works-right/
I find it works well across all browsers. I've hacked it round to work well with ASP .NET, and that was pretty easy.

It isn't possible to apply formatting to a standard dialogue box. However if you really want to format it you could flash up the message in HTML either next to the button or as a absolutely placed div, which you could format with CSS.

Else, use something like a LightBox based solution like Thickbox?