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In CSS what is the difference between “.” and “#” when declaring a set of styles?
...here the style is repeated, e.g. say you head a special form of header for error messages, you could create a style h1.error {} which would only apply to <h1 class="error">
Specificity
Another aspect where selectors differ is in their specificity - an id selector is deemed to be more specifi...
How do I import other TypeScript files?
...ire" code in either of them... also " import moo=module("moo"); " gives an error that the name moo does not exist in the current scope , highlighting the module("moo") part
– Roger Johansson
Oct 17 '12 at 9:27
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Fast way to discover the row count of a table in PostgreSQL
... and counts rows in it. A bigger sample increases the cost and reduces the error, your pick. Accuracy depends on more factors:
Distribution of row size. If a given block happens to hold wider than usual rows, the count is lower than usual etc.
Dead tuples or a FILLFACTOR occupy space per block. If...
Accessing console and devtools of extension's background.js
...tensions and I can't seem to log to console from my background js. When an error occurs (because of a syntax error, for example), I can't find any error messages either.
...
Create thumbnail image
...ges generally. If you try to resize a PNG image like this, you'll get this error.
– HBlackorby
Jun 4 '15 at 21:45
Real...
Returning multiple values from a C++ function
... put the function definition of divide into a separate cpp file? I get the error error: use of ‘auto divide(int, int)’ before deduction of ‘auto’. How do I solve this?
– Adriaan
Feb 23 '18 at 20:26
...
Render HTML to an image
... = dataUrl;
document.appendChild(img);
})
.catch(function (error) {
console.error('oops, something went wrong!', error);
});
share
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Set custom HTML5 required field validation message
...ment (DOM node) and it must return a string which is then displayed as the error message.
Compatibility
Tested in:
Chrome Canary 47.0.2
IE 11
Microsoft Edge (using the up-to-date version as of 28/08/2015)
Firefox 40.0.3
Opera 31.0
Old answer
You can see the old revision here: https://stacko...
Creating an abstract class in Objective-C
...NSInvalidAbstractInvocation(). Calling an abstract method is a programming error, which is why it throws an exception. Abstract factories are commonly implemented as class clusters.
– quellish
Aug 2 '14 at 23:40
...
How to set environment variables in Python?
...EBUSSY'] = str(myintvariable)
then for retrieval, consider that to avoid errors, you should try
os.environ.get('DEBUSSY', 'Not Set')
possibly substitute '-1' for 'Not Set'
so, to put that all together
myintvariable = 1
os.environ['DEBUSSY'] = str(myintvariable)
strauss = int(os.environ.get('S...