&gt; A **reflow** computes the layout of the page.  A reflow on an element recomputes the dimensions and position of the element, and it also triggers further reflows on that element’s children, ancestors and elements that appear after it in the DOM.  Then it calls a final repaint.  Reflowing is very expensive, but unfortunately it can be triggered easily.
&gt; 
&gt; Reflow occurs when you:

&gt;  - insert, remove or update an element in the DOM
 - modify content on the page, e.g. the text in an input box
 - move a DOM element
 - animate a DOM element
 - take measurements of an element such as offsetHeight or getComputedStyle
 - change a CSS style
 - change the className of an element
 - add or remove a stylesheet
 - resize the window
 - scroll

For more information, please refer here: [Repaints and Reflows: Manipulating the DOM responsibly][1]


  [1]: https://sites.google.com/site/getsnippet/javascript/dom/repaints-and-reflows-manipulating-the-dom-responsibly

&gt; Reflow is the name of the web browser process for re-calculating the
&gt; positions and geometries of elements in the document, for the purpose
&gt; of re-rendering part or all of the document.

https://developers.google.com/speed/articles/reflow

`display:none` hide the `div` as if the `div` is not rendered whereas `visibility:hidden` only hides but the space is still occupied

It means, that if you will set `display: none;`, your browser will recalculate positions of DOM elements, if visibility: hidden; - not. Think, it because `visibility: hidden;` does not change element sizes in DOM.

trying to upgrade to Rails 4.2, using delayed_job_active_record. I&#39;ve not set the delayed_job backend for test environment as thought that way jobs would execute straight away. 

I&#39;m trying to test the new &#39;deliver_later&#39; method with RSpec, but I&#39;m not sure how.

Old controller code:

    ServiceMailer.delay.new_user(@user)

New controller code:

    ServiceMailer.new_user(@user).deliver_later

I USED to test it like so:

    expect(ServiceMailer).to receive(:new_user).with(@user).and_return(double(&quot;mailer&quot;, :deliver =&gt; true))

Now I get errors using that. (Double &quot;mailer&quot; received unexpected message :deliver_later with (no args))

Just

    expect(ServiceMailer).to receive(:new_user)

fails too with &#39;undefined method `deliver_later&#39; for nil:NilClass&#39;

I&#39;ve tried some examples that allow you to see if jobs are enqueued using test_helper in ActiveJob but I haven&#39;t managed to test that the correct job is queued.

    expect(enqueued_jobs.size).to eq(1)

This passes if the test_helper is included, but it doesn&#39;t allow me to check it is the correct email that is being sent.

What I want to do is:

 - test that the correct email is queued (or executed straight away in test env)
 - with the correct parameters (@user)

Any ideas??
thanks

How to test ActionMailer deliver_later with rspec

Suppose I know the process ID.  I want to find the process name by its ID, using windows batch script.  How can I do this?

Find Process Name by its Process ID

I was reading about the difference between two CSS properties `display:none` and `visibility:hidden` and encountered the **DOM reflow** term.

The statement was
&gt; `display: none` causes a DOM reflow whereas `visibility: hidden` does not. 

So my question is: 
### What is DOM reflow and how does it work?

What is DOM reflow?

I was reading about the difference between two CSS properties <code>display:none</code> and <code>visibility:hidden</code> and encountered the DOM reflow term.
The statement was
> <code>display: none</code> causes a DOM reflow whereas <code>visibility: hidden</code> does not.
So my question is:
<h5 id="what-is-dom-reflow-and-how-does-it-work"><a aria-hidden="true" tabindex="-1" href="#what-is-dom-reflow-and-how-does-it-work"></a>What is DOM reflow and how does it work?</h5>

How can I format the text of a placeholder in italics, but when someone writes inside the textbox, the text shouldn&#39;t be in italics.

code:

    &lt;input type=&quot;text&quot; id=&quot;search&quot; placeholder=&quot;Search&quot; style=&quot;font-style:italic&quot;&gt;

How can I place italic text only on placeholder but not whole input?

How to make only placeholder italics in input

I want to give spacing between buttons is there a way to give spacing using bootstrap so that they will be consistent for different screen resolutions.

I tried using `margin-left` But is it the correct way to do this.??

Here is the [demo][1]


  [1]: http://www.bootply.com/dDfIHeZizW


HTML:

    &lt;div class=&quot;btn-toolbar text-center well&quot;&gt;
        &lt;button type=&quot;button&quot; class=&quot;btn btn-primary btn-color btn-bg-color btn-sm col-xs-2 margin-left&quot;&gt;
          &lt;span class=&quot;glyphicon glyphicon-plus&quot; aria-hidden=&quot;true&quot;&gt;&lt;/span&gt; ADD PACKET
        &lt;/button&gt;
        &lt;button type=&quot;button&quot; class=&quot;btn btn-primary btn-color btn-bg-color btn-sm col-xs-2 margin-left&quot;&gt;
          &lt;span class=&quot;glyphicon glyphicon-edit&quot; aria-hidden=&quot;true&quot;&gt;&lt;/span&gt; EDIT CUSTOMER
        &lt;/button&gt;
        &lt;button type=&quot;button&quot; class=&quot;btn btn-primary btn-color btn-bg-color btn-sm col-xs-2 margin-left&quot;&gt;
          &lt;span class=&quot;glyphicon glyphicon-time&quot; aria-hidden=&quot;true&quot;&gt;&lt;/span&gt; HISTORY
        &lt;/button&gt;
        &lt;button type=&quot;button&quot; class=&quot;btn btn-primary btn-color btn-bg-color btn-sm col-xs-2 margin-left&quot;&gt;
          &lt;span class=&quot;glyphicon glyphicon-trash&quot; aria-hidden=&quot;true&quot;&gt;&lt;/span&gt; DELETE CUSTOMER
        &lt;/button&gt;
    &lt;/div&gt;

CSS:

    .margin-left{
        margin-left: 80px !important;
    }



How to give spacing between buttons using bootstrap

I&#39;m using Google reCAPTCHA and have been able to add the CAPTCHA component to my page inside a form. But when I submit the form there&#39;s no validation taking place to check if the CAPTCHA has been solved.

How do I validate that the CAPTCHA component has been solved when submitting my form? Or, in other words, how do I make my CAPTCHA component required?

How can I make reCAPTCHA a required field?

I have a form that is iframed into a web page. Upon completion of the form, a YouTube video is displayed from using iframe embed.

When I enter full screen mode of the YouTube video, nothing really happens.

Is the fullscreen of the nested iframe constrained by the dimensions of the parent iframe?




YouTube iframe embed - full screen

How to fill the whole HTML5 `&lt;canvas&gt;` with one color.

I saw some solutions such as [this][1] to change the background color using CSS but this is not a good solution since the canvas remains transparent, the only thing that changes is the color of the space it occupies. 


Another one is by creating something with the color inside the canvas, for example, a rectangle([see here][2]) but it still does not fill the whole canvas with the color (in case the canvas is bigger than the shape we created).

Is there a solution to fill the whole canvas with a specific color?


  [1]: https://stackoverflow.com/questions/20488590/set-backgroundcolor-styles-and-opacity-to-html5-canvas
  [2]: https://stackoverflow.com/questions/11702650/html5-canvas-how-to-fill-a-specific-context

How to fill the whole canvas with specific color?

I have something like this:

    gulp.task(&#39;default&#39;, [&#39;css&#39;, &#39;browser-sync&#39;] , function() {
    
    	gulp.watch([&#39;sass/**/*.scss&#39;, &#39;layouts/*.css&#39;], function() {
    		gulp.run(&#39;css&#39;);
    	});
    
    });

but it does not work, because it watches two directories, the sass and the layouts directory for changes.

How do I make it work, so that gulp watches anything that happens inside those directories?

How to Gulp-Watch Multiple files?

We&#39;ve just started to implement the new google recaptcha as listed https://www.google.com/recaptcha/intro/index.html

However the new method seems to be contained within an iFrame rather than embedded into the page thus making applying CSS more difficult.

However we&#39;ve got our form which is 400px wide so would like to have the recaptcha the same width.

Currently it looks like, however we&#39;d like it the same with as the rest.

Does anybody know how to do this yet?

Thanks

![recaptcha layout example][1]


  [1]: http://i.stack.imgur.com/dI2Hu.png

Change New Google Recaptcha (v2) Width

I have not had much success finding how to style Google&#39;s new recaptcha (v2). The eventual goal is to make it responsive, but I am having difficulty applying styling for even simple things like width.

Their [API documentation][1] does not appear to give any specifics on how to control styling at all other than the _theme_ parameter, and simple CSS &amp; JavaScript solutions haven&#39;t worked for me.

Basically, I need to be able to apply CSS to Google&#39;s new version of reCaptcha. Using JavaScript with it is acceptable.

  [1]: https://developers.google.com/recaptcha/docs/display

ReCaptcha API v2 Styling

I&#39;ve spent a lot of time working with Foundation and less time working with Bootstrap.  I&#39;m having an issue with responsiveness in Bootstrap that I don&#39;t understand because this just seems to work in Foundation.  The issue is that, while the grid responsiveness works as expected, my fonts are getting scaled so tiny that it is almost illegible on mobile.  Notice in my example below that I set the font size to 14px, but on mobile this is becoming very tiny.  You can see this by clicking on the mobile button in the Chrome dev tools.

The html to reproduce this is very simple, here is a jsbin: http://jsbin.com/lumepumufu/1/

And here&#39;s the html:

    &lt;html&gt;
      &lt;head&gt;
        &lt;link href=&quot;//maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap.min.css&quot; rel=&quot;stylesheet&quot; type=&quot;text/css&quot; /&gt;
      &lt;/head&gt;
      &lt;body style=&quot;font-size:14px&quot;&gt;
        &lt;div class=&quot;container&quot;&gt;
          &lt;div class=&quot;row&quot;&gt;
            &lt;div class=&quot;col-lg-4&quot;&gt;col-lg-4&lt;/div&gt;
            &lt;div class=&quot;col-lg-4&quot;&gt;col-lg-4&lt;/div&gt;
            &lt;div class=&quot;col-lg-4&quot;&gt;col-lg-4&lt;/div&gt;
          &lt;/div&gt;
        &lt;/div&gt;
      &lt;/body&gt;
    &lt;/html&gt;

Bootstrap font scaling too small on mobile

I have a div in which I animate the content:

&lt;!-- begin snippet: js hide: false --&gt;

&lt;!-- language: lang-css --&gt;

    #container {
      position: relative;
      width: 100px;
      height: 100px;
      border-style: inset;
    }
    #content {
      visibility: hidden;
      -webkit-animation: animDown 1s ease;
      position: absolute;
      top: 100px;
      width: 100%;
      height: 100%;
      background-color: lightgreen;
    }
    #container:hover #content {
      -webkit-animation: animUp 1s ease;
      animation-fill-mode: forwards;
      -webkit-animation-fill-mode: forwards;
    }
    @-webkit-keyframes animUp {
      0% {
        -webkit-transform: translateY(0);
        visibility: hidden;
        opacity: 0;
      }
      100% {
        -webkit-transform: translateY(-100%);
        visibility: visible;
        opacity: 1;
      }
    }
    @-webkit-keyframes animDown {
      0% {
        -webkit-transform: translateY(-100%);
        visibility: visible;
        opacity: 1;
      }
      100% {
        -webkit-transform: translateY(0);
        visibility: hidden;
        opacity: 0;
      }
    }

&lt;!-- language: lang-html --&gt;

    &lt;div id=&quot;container&quot;&gt;
      &lt;div id=&quot;content&quot;&gt;&lt;/div&gt;
    &lt;/div&gt;



&lt;!-- end snippet --&gt;

On hover, the content slides into the container div.
When I refresh the page and the page loads, the `#content`&#39;s animDown animation will run, and I&#39;d prefer it to run only after a hover event.

Is there a way to do this pure CSS, or I have to figure something out in JS?

http://jsfiddle.net/d0yhve8y/

How to prevent a CSS keyframe animation from running on page load?

The React way to set which option is selected for a select box, is to set a special `value` prop on the `&lt;select&gt;` itself, corresponding to the `value` attribute on the `&lt;option&gt;` element you desire to be selected. For a `multiple` select this prop can accept an array instead.

Now because this is a special attribute, I&#39;m wondering what the canonical way is to *retrieve* the selected options in the same array-of-option-values-structure when the user changes things (so I can pass it through a callback to a parent component etc), since presumably the same `value` property won&#39;t be available on the DOM element.

To use an example, with a text field you would do something like this (JSX):

    var TextComponent = React.createClass({
      handleChange: function(e) {
        var newText = e.target.value;
        this.props.someCallbackFromParent(newText);
      },
      render: function() {
        return &lt;input type=&quot;text&quot; value={this.props.someText} onChange={this.handleChange} /&gt;;
      }
    });

What is the equivalent to replace `???` for this multiple select component?

    var MultiSelectComponent = React.createClass({
      handleChange: function(e) {
        var newArrayOfSelectedOptionValues = ???;
        this.props.someCallbackFromParent(newArrayOfSelectedOptionValues);
      },
      render: function() {
        return (
          &lt;select multiple={true} value={this.props.arrayOfOptionValues} onChange={this.handleChange}&gt;
            &lt;option value={1}&gt;First option&lt;/option&gt;
            &lt;option value={2}&gt;Second option&lt;/option&gt;
            &lt;option value={3}&gt;Third option&lt;/option&gt;
          &lt;/select&gt;
        );
      }
    });

Retrieving value from &lt;select&gt; with multiple option in React

I&#39;m trying to inspect CSS properties from an input into a table cell. The input appears on click and disappears on lost focus, as when I try to inspect it.
How can I do it to don&#39;t lost focus while I move to another window (the inspector)?


How can I inspect html element that disappears from DOM on lost focus?

I&#39;m trying to find an element with `document.querySelector` which has *multiple data-attributes*:

    &lt;div class=&quot;text-right&quot; data-point-id=&quot;7febe088-4eca-493b-8455-385b39ad30e3&quot; data-period=&quot;current&quot;&gt;-&lt;/div&gt;

I thought about something like this:

    document.querySelector(&#39;[data-point-id=&quot;7febe088-4eca-493b-8455-385b39ad30e3&quot;] [data-period=&quot;current&quot;]&#39;)

But it does not work. &lt;br&gt;
However, it works well, if I put the second data-attribute in a child-element like:

    &lt;div class=&quot;text-right&quot; data-point-id=&quot;7febe088-4eca-493b-8455-385b39ad30e3&quot;&gt; &lt;span data-period=&quot;current&quot;&gt;-&lt;/span&gt; &lt;/div&gt;

So, is there an option to search for **both attributes at once**?&lt;br&gt;I&#39;ve tried several options but I don&#39;t get it.

document.querySelector multiple data-attributes in one element

I&#39;m looking for a way to detect if a click event happened outside of a component, as described in this [article][1]. jQuery closest() is used to see if the target from a click event has the dom element as one of its parents. If there is a match the click event belongs to one of the children and is thus not considered to be outside of the component.

So in my component I want to attach a click handler to window. When the handler fires I need to compare the target with the dom children of my component.

The click event contains properties like &quot;path&quot; which seems to hold the dom path that the event has travelled. I&#39;m not sure what to compare or how to best traverse it, and I&#39;m thinking someone must have already put that in a clever utility function... No?

  [1]: https://css-tricks.com/dangers-stopping-event-propagation/

Detect click outside React component

I tend to have a lot of these in my code

    if(shouldElementBeVisible)
        $element.show()
    else
        $element.hide()

Is there any more elegant way packaged with javascript, jquery, or underscore? Ideally I want something that looks like this

    $element.showOrHideDependingOn(shouldElementBeVisible)

Hide/show element with a boolean

In Java, we have the package protected (default) modifier for classes, which allows us to have many classes in a single package but exposes only a few and keeps the logic encapsulated.

With Kotlin this doesn&#39;t seem to be the case. If I want a few classes to be visible to each other but no further, I have to use a private modifier which limits visibility to a single file. 

So if you want 10 classes in a package but only one of them to be public, you&#39;d have to have one huge file with all the classes in it (and `private` all over the place).

Is this normal practice or there is a way to achieve some similar modularity in Kotlin?

I don&#39;t understand: if they have the notion of a package, why did they get rid of package protected access?

**Update: We might have package protected visibility after all**       
[see the discussion here][1]


  [1]: https://discuss.kotlinlang.org/t/kotlin-to-support-package-protected-visibility/1544

**Update: If you read through the discussion and still think this is a must-have feature for the language, please vote [here](https://youtrack.jetbrains.com/issue/KT-29227)** 

Package protected alternative in Kotlin

Probably similar to the question, https://stackoverflow.com/questions/1801718/why-can-outer-java-classes-access-inner-class-private-members or https://stackoverflow.com/questions/31478718/access-to-superclass-private-fields-using-the-super-keyword-in-a-subclass .

But there are some differences: the children class can access the private members of their parent (and **only the nearest parent**) class.

Given the sample code below:
        
	public class T {

		private int t;

		class T1 {
			private int t1;

			public void test() {
				System.out.println(t);
			}
		}

		class T2 extends T1 {

			private int t2;

			public void test() {
				System.out.println(t);
				System.out.println(super.t1);
				System.out.println(this.t2);
			}
		}

		class T3 extends T2 {

			public void test() {
				System.out.println(t);
				System.out.println(super.t1); // NG: t1 Compile error! Why?
				System.out.println(super.t2); // OK: t2 OK
			}
		}
	}


Why can nested child classes access private members of their parent class, but grandchildren cannot?

In Java it&#39;s possible to hide a class&#39; main constructor by making it `private` and then accessing it via a `public` `static` method inside that class:

    public final class Foo {
    	/* Public static method */
    	public static final Foo constructorA() {
    		// do stuff
    		
    		return new Foo(someData);
    	}
    	
    	private final Data someData;
    	
    	/* Main constructor */
    	private Foo(final Data someData) {
    		Objects.requireNonNull(someData);
    		
    		this.someData = someData;
    	}
    	
    	// ...
    }

How can the same be reached with Kotlin without separating the class into a `public` interface and a `private` implementation? Making a constructor `private` leads to it not being accessible from outside the class, not even from the same file.

Content Type	Original Author	Original Content on Stackoverflow
Question	Suresh Karia	View Question on Stackoverflow
Solution 1 - Html	Karlen Kishmiryan	View Answer on Stackoverflow
Solution 2 - Html	Vitorino fernandes	View Answer on Stackoverflow
Solution 3 - Html	degr	View Answer on Stackoverflow

What is DOM reflow?

Html Problem Overview

What is DOM reflow and how does it work?

Html Solutions

Solution 1 - Html

Solution 2 - Html

Solution 3 - Html

Find Process Name by its Process ID

How to test ActionMailer deliver_later with rspec

Attributions