It means you never put in your title. I will give you an example, make sure to put it in your body section. <title>Welcome to my website!</title>
When a webpage displays a "Syntax Error" it means that the code for the particular page was written incorrectly and does not follow standard rules of the Syntax programming language so nothing except the error will be displayed as the code cannot be understood.
When a constructor is not define in java then the instance used in class is not optimised the value and therefore some times it generates some garbage value. By the way , When we not define a constructor then generally it not distrub the execution of the program.
Not sure what you mean by setting the javascript program as the background of your webpage, but if you mean that you want to incorporate some javascript functionality to your webpage like changing the html content when people click on an image or hover over some text, and you have not learned javascript yet, a good place to start is Lynda.com. You should also consider just learning jquery. Jquery is a much easier to learn and simpler to type code that employs the same functionality as javascript and much more. You can also learn how to write jquery on Lynda.com. You will just need to download their library or link to Google's version of it by placing one line of markup in your html document, then you create your javascript document and write your scripts in it.
The linker error message type is absolute and non-overlay but occurs in more than one input file means entry section was included many times. Even entering two times gives the error message.
It is not possible to make a message board purely with HTML. To do so you need a programming language. HTML is only for the design of your page, like how it looks, the colours it uses, the size of the text, the font of the text and so on. HTML doesn't do any processing, which is what a message board needs. So to create your own message board you need to know how to write programs. There are lots of message board providers that allow you to use their systems to create your own message board, so maybe that is what you should look at doing, if you want to get your own message board quickly. To learn how to program one would mean having to learn all about programming and that can take a very long time to do.
Generally, "undefined" is an indication that the coding behind the page is attempting to use a variable that isn't initialized. In JavaScript, it can also be an error message that signifies that the script is trying to access a thing that isn't present.
A term that is undefined mean simply that it is not defined. The prefix un means not, and if you add it to the word defined, ta da, you get undefined.
That can mean that your computer is broken or the webpage is not good.
Undefined means that it is not possible to determine the answer of the question. For example: 18/0 - you can not divide anything by zero (0). Therefore the answer of this question is Undefined of Undefinable.
An undefined symbol is where you make a reference to a symbol, but you have not yet declared and defined it.
'Kirvlo' is as yet undefined.
A number divided by 0.
Undefined is defined. Define means to set the limits, explain. So, undefine means not to set limits or not to explain.
"Plutter" remains undefined in the English language.
"Berlud" doesn't have a common meaning in English. It could be a typo or a word in a different language. Without more context, it's hard to give a specific definition.
Undefined terms are numbers that con't be determined, like 1/0. Not to be confused with irrational numbers, though.
I am not quite sure what you mean with "log you"; the log is calculated for numbers. The following logarithms are undefined: For real numbers: the logarithm of zero and of negative numbers is undefined. For complex numbers: the logarithm of zero is undefined.