How to draw double headed arrow in HTML? [closed] - javascript

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I want to create a double headed arrow/html element in my web page with some text in it. Basically an arrow like in shapes in MS Word.
Also, I want it to be clickable so that I can trigger any event on the click.
How can I accomplish this?

Some double-headed arrow characters exist in UTF-8 if you don't want to draw it yourself in CSS :
U+2194 ↔
U+2195 ↕
U+21D4 ⇔
U+21D5 ⇕
This page has a lot of them if you need more.

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Why does it say it is assigned a value but never used? [closed]

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I tried changing the string, and tried repeating everything over and over. Nothing seems to work.
Edit: Thanks for the replies, it is working now.
It says that you create a new variable let temperature but you are not using it anywhere in your code
If you want to use it in the alert you should use backticks `` for s tring interpolation instead of single quotes ''

Is there a way to produce different resolutions of same image at once [closed]

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I was downloading wallpapers from https://wallpapersden.com/street-fighter-fortnite-wallpaper/ .
When I clicked on the download button another page opened
"https://images.wallpapersden.com/image/download/street-fighter-fortnite_bGtoaW6UmZqaraWkpJRmbmdlrWZlbWU.jpg "
I want to know what is images.wallpapers.com . Is this another website?
images.wallpapersden.com is a subdomian of wallpapersden.com where they store there images. They have created it for convenience in order to handle their images better. it is same as drive.google.com and mail.google.com.

Is there any way to read the headset button event in a web browser using JavaScript (especially Chrome)? [closed]

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I am trying to make a web app wherein it reacts to an event from the headset button. I know that the keyCode for the head set is 79. (I checked it using a key event reader app.) Nothing happens when I use it. Is there any way to detect it?

what plugin that they used for navigation on atmospherejs.com? [closed]

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I have found cool site and have very interested with effect that they put on navigation (when you click on menu icon on the top left). can you guys tell me how to achieve this? I'm just learning js so I assume they use some kind of plugin like html2canvas to grab the screen.
I really appreciate if you can help :)
You can have the same menu effect by Codrops.
You can also download the source from their site.

Dim all children (except one being hovered on) [closed]

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I would like to hide all the children except the one being hovered on. I can't seem to figure out why it won't work - I've included the full sites CSS and everything on this
http://jsfiddle.net/DLjEg/1/
You're using jQuery, but you have the library set to MooTools...switch it to jQuery and it works fine :-)

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