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My .style.background doesn't style the item

I am trying to make a timer and make it so that when the time gets below 10 seconds the text turns red. I am using backgorund-clip to style my text, but for some reason my js doesn't style the backgorund of the element I want.
Here is my JavaScript:
if (miliseconds < 10 && seconds < 10)
document.getElementById("timer").textContent = `0${seconds}:0${miliseconds}`;
else if (miliseconds < 10)
document.getElementById("timer").textContent = `${seconds}:0${miliseconds}`;
else if (seconds < 10)
{
document.getElementById("timer").textContent = `0${seconds}:${miliseconds}`;
document.getElementById("timer-back-2").style.background = "repeating-linear-gradient(to left, red, red 5px, black 5px, black 6px);";
}
else
{
document.getElementById("timer").textContent = `${seconds}:${miliseconds}`;
document.getElementById("timer-back-2").style.background = "repeating-linear-gradient(to left, blue, blue 5px, black 5px, black 6px);"
}
and here is my CSS:
#timer-back-2{
width: 100%;
height: 100%;
margin: 0;
background: repeating-linear-gradient(to left, yellow, yellow 5px, black 5px, black 6px);
-webkit-background-clip: text;
background-clip: text;
-webkit-text-fill-color: transparent;
}
#timer{
width: 100%;
height: 100%;
margin: 0;
background: repeating-linear-gradient(to top, transparent, transparent 5px, black 5px, black 6px);
z-index: 3;
font-size: 50px;
font-family: "8-bit-operator";
display: flex;
justify-content: center;
align-items: center;
-webkit-background-clip: text;
background-clip: text;
}

Don't try to toggle the property value in javascript, use classes instead. Use background-image instead of background for repeating-linear-gradient(), otherwise the background property from the other classes might override the other background properties already set.
const timer = document.getElementById('timer-back-2');
// turn it red
timer.classList.add("red");
// turn it blue
timer.classList.remove("red");
timer.classList.add("blue");
// turn it yellow
timer.classList.remove("red");
timer.classList.remove("blue");
// demo changes color every second
window.setInterval(function() {
timer.classList.remove("blue");
timer.classList.remove("red");
const time = (new Date).getTime();
if (time % 2 == 0) {
timer.classList.add("red");
} else if (time % 3 == 0) {
timer.classList.add("blue");
}
}, 1000);
#timer-back-2 {
width: 100px;
height: 100px;
font-size: 32px;
background-image: repeating-linear-gradient(to left, yellow, yellow 5px, black 5px, black 6px);
-webkit-background-clip: text;
background-clip: text;
-webkit-text-fill-color: transparent;
}
#timer-back-2.red {
background-image: repeating-linear-gradient(to left, red, red 5px, black 5px, black 6px);
}
#timer-back-2.blue {
background-image: repeating-linear-gradient(to left, blue, blue 5px, black 5px, black 6px);
}
<div id="timer-back-2">Back 2</div>

why inner style is not working in html progress

I am trying to apply linear-gradient to html progress bar but it's not applying the gradient
var customColor = '#cf014d';
ReactDOM.render(React.createElement("progress", { max: "100", value: "80",
style: { color: "linear-gradient(to left, #fff, #fff)" } }), document.getElementById('root'));
<script src="//unpkg.com/react/umd/react.development.js"></script>
<script src="//unpkg.com/react-dom/umd/react-dom.development.js"></script>
<div id="root"></div>

you need to use background: instead of color:
color - is for text color

Use background: for the background color. color is for the foreground color.
But, beyond that, progress bars are rendered in a proprietary way by each user agent, one set of styling rules won't work for all browsers. Just setting the style of the element is not enough, the browser renders a progress bar as a series of elements and each part must be styled correctly.
Here' is an example of creating the progress bar with React, but styling it with static CSS for rendering in browsers compliant with the -webkit- vendor prefix.
ReactDOM.render(React.createElement("progress", { max: "100", value: "80" }), document.getElementById('root'));
progress[value] {
/* Reset the default appearance */
-webkit-appearance: none;
appearance: none;
width: 500px;
height: 20px;
}
progress[value]::-webkit-progress-bar {
background-color: #eee;
border-radius: 25px;
box-shadow: 0 2px 5px rgba(0, 0, 0, 0.25) inset;
}
progress[value]::-webkit-progress-value {
background-image:
-webkit-linear-gradient(-45deg,
transparent 33%, rgba(0, 0, 0, .1) 33%,
rgba(0,0, 0, .1) 66%, transparent 66%),
-webkit-linear-gradient(top,
rgba(255, 255, 255, .25),
rgba(0, 0, 0, .25)),
-webkit-linear-gradient(left, #09c, #f44);
border-radius: 2px;
background-size: 35px 20px, 100% 100%, 100% 100%;
}
<script src="//unpkg.com/react/umd/react.development.js"></script>
<script src="//unpkg.com/react-dom/umd/react-dom.development.js"></script>
<div id="root"></div>

Background property will style the "background" part - not the value.
Here is a nice article for styling the progress bar.
https://css-tricks.com/html5-progress-element/

Create Flash Cards Dynamically in JQuery?

Is it possible, with the following Fiddle, to allow a user to create flash cards dynamically by inputting data into an <input> field?
Fiddle
If it's possible, it would be very much appreciated if a new fiddle could be provided, as I am new to coding.
Thank You!
$(function(){
var maxCards = $('.card').length;
// turn card
for (var i = 1; i <= maxCards; ++i) {
$('._' + i).click(function(){
$(this).addClass('flipped');
$(this).find('.front').addClass('showingBack');
$(this).find('.front').css("z-index", 0);
$(this).css("z-index", i);
});
}
// reset stack
$('#reset button').click(function(){
$('.card').removeClass('flipped');
$('.card').find('.front').removeClass('showingBack');
$('.card').find('.front').css("z-index", 2);
for (var j = 0; j < maxCards; ++j) {
$('.card:eq(' + j + ')').css("z-index", maxCards - j);
}
});
});
$(document).ready(function() {
var max_fields = 20; //maximum input boxes allowed
var wrapper = $(".input_fields_wrap"); //Fields wrapper
var add_button = $(".add_field_button"); //Add button ID
var x = 1; //initlal text box count
$(add_button).click(function(e){ //on add input button click
e.preventDefault();
if(x < max_fields){ //max input box allowed
x++; //text box increment
$(wrapper).append('<div><input placeholder="Question" type="text" name="mytext[]"/><input placeholder="Answer" type="text" name="mytext[]"/>Remove</div>'); //add input box
}
});
$(wrapper).on("click",".remove_field", function(e){ //user click on remove text
e.preventDefault(); $(this).parent('div').remove(); x--;
})
});
body {
background: #ccc;
font-family: Indie Flower, sans-serif;
}
#reset {
text-align: center;
}
#reset button {
background: rgba(0, 0, 0, 0.4);
border: 0;
color: white;
font-size: 12pt;
margin: auto;
width: 120px;
height: 30px;
}
#reset button:active {
background: rgba(0, 0, 0, 0.8);
}
#stack {
margin: auto;
position: relative;
width: 300px;
}
.card {
border: 1px solid #888;
position: absolute;
width: 300px;
height: 180px;
transform-origin: 0% 0%;
}
.card .front {
background: white;
font-size: 24pt;
position: absolute;
width: 300px;
height: 180px;
z-index: 2;
}
.card .front p {
line-height: 3em;
text-align: center;
}
.card .back {
background: white linear-gradient(transparent, transparent 20%, hotpink 20%, hotpink 21%, transparent 21%, transparent 31%, lightblue 31%, lightblue 32%, transparent 32%, transparent 42%, lightblue 42%, lightblue 43%, transparent 43%, transparent 53%, lightblue 53%, lightblue 54%, transparent 54%, transparent 64%, lightblue 64%, lightblue 65%, transparent 65%, transparent 75%, lightblue 75%, lightblue 76%, transparent 76%, transparent 86%, lightblue 86%, lightblue 87%, transparent 87%, transparent 97%);
font-size: 11pt;
position: absolute;
width: 300px;
height: 180px;
transform: rotateY(180deg);
z-index: 1;
}
.card .back p {
margin: 40px 5px 5px 5px;
}
._1 {
top: 0px;
right: 0px;
z-index: 3;
}
._2 {
top: 3px;
right: 2px;
z-index: 2;
}
._3 {
top: 6px;
right: 4px;
z-index: 1;
}
._4 {
top: 9px;
right: 6px;
z-index: 0;
}
.flipped {
transform: rotateY(180deg) translateX(30px);
animation: flip 1s;
}
.showingBack {
animation: showBack 1s;
}
#keyframes flip {
from {
transform: rotateY(0deg) translateX(0px);
}
to {
transform: rotateY(180deg) translateX(30px);
}
}
#keyframes showBack {
0% {
z-index: 2;
}
25% {
z-index: 2;
}
50% {
z-index: 0;
}
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<h2>
Import FlashCard Text Below:
</h2>
<div class="input_fields_wrap">
<button class="add_field_button">Add More Flash Cards</button>
<button>
Create Flash Cards
</button>
<div><input placeholder="Question" type="text" name="mytext[]"><input placeholder="Answer" type="text" name="mytext[]"/></div>
</div>
<hr>
<p id='reset'>
<button align="center">Reset stack</button>
</p>
<div id='stack'>
<div class='card _1'>
<div class='front'>
<p>What is 1+3?</p>
</div>
<div class='back'>
<p>4</p>
</div>
</div>
<div class='card _2'>
<div class='front'>
<p>What is 2-1?</p>
</div>
<div class='back'>
<p>1</p>
</div>
</div>
<div class='card _3'>
<div class='front'>
<p>What is Pi?</p>
</div>
<div class='back'>
<p>3.14...</p>
</div>
</div>
<div class='card _4'>
<div class='front'>
<p>What is 1/2?</p>
</div>
<div class='back'>
<p>0.5</p>
</div>
</div>
</div>

Here's a totally different way to create flash cards.
Flash card content goes into google drive sheets. Easy to use, easy to update. Then use Google's API to download the data in JSON format.
The code is as simple as putting this code in the body of your html file.
<script src="https://spreadsheets.google.com/feeds/list/XXXXXXXX/od6/public/full?alt=json-in-script&callback=useJSONdata"></script>
In the script portion of your site you would have:
function useJSONdata(root) {
console.log(JSON.stringify(root, null, 4));
// Understanding the object root is a great way to understand what is going on with JSON
var entries = root.feed.entry || []; .. etc.
Analyse the data you need, run a for loop, create a string of content to be pasted back into the Document Object Model / HTML / body.
Finally use jQuery mobile tools to create a mobile ready application. I used both their js and css files. Very nice. I made use of three mobile events “swipeleft” “swiperight” and “taphold”. Swipe left to go to next slide. Swipe right to go to previous slide. Long touch and hold to reveal answer to question.
I realize this wasn't exactly what you were asking for, and although an active input is nice, I'm thinking a spreadsheet format for a series of flash cards with data persistence (and the ability to do edits) is a pretty good way to go.

HTML input range Style in Firefox

I´ve got a CSS problem with a input-range element:
<input type="range" id="difficultSelect" max="3" min="1" value="2"/>
the css looks like this:
-webkit-appearance: none;
z-index: 102;
width: 225px;
height: 5px;
margin-left: 95px;
margin-top: 15px;
border-radius: 2px;
background: linear-gradient(to right, #83f922 0%,#ff4c00 100%);
background: -webkit-gradient(linear, left top, right top, color-stop(0%,#83f922),
color-stop(100%,#ff4c00));
background: -moz-linear-gradient(left, #83f922 0%, #ff4c00 100%);
background: -webkit-linear-gradient(left, #83f922 0%,#ff4c00 100%);
As u can see, the background of the slider should show a linear-gradient from green to red.
In Chrome it displays as intended, but in Firefox there is the background-gradient, but ontop of it is the normal "grey" bar of the slider: http://imgur.com/xcxuZXV
Were is my mistake? Firefox Version ist 27.0.1
THANKS

Mozilla has a separate property to style the shadow dom of the input (which is what -webkit-appearance:none; takes care of for webkit):
::-moz-range-track {background:transparent; border:0px;}
On a side note, you can also style the slide/grip/button/thumb:
/* These need to be separated, not combined with a comma */
::-webkit-slider-thumb { /* ... */}
::-moz-range-thumb { /* ... */}

How to create an triangle shape (fixed height, width=100%) with background

I have a graphic background, and I need to display a colored triangle in the top left corner (independing the resolution).
Can I create a triangle shaped element using only HTML/CSS/JS with width = 100% and height = 200px with background = red?
I can create it by IMG with width=100%, but I was hoping for a better solution than resizing an image.
The solution needs to be compatible with IE7+ and using browser's versions (more than 2%).
Thanks

Because you can't create a border which has a percentage, try using vw (viewer width) instead. So:
.triangle{
width: 0;
height: 0;
border-bottom: 600px solid blue;
border-left: 100vw solid transparent;
}

Vw units aren't supported by IE8, you will need to use a JS fallback for browsers that don't support these units.
Here is a jQuery script that sets the border-width according to the window size and adjusts it on window resize. Tested in IE8 (IE tester) :
$(document).ready(function() {
function triangle() {
var width = $('#wrap').width(),
border = width / 4;
$("#wrap .tr").css({
"border-left": border + "px solid #fff",
"border-bottom": border + "px solid transparent"
});
}
triangle();
$(window).on('resize', triangle);
});
body {
background: #fff;
}
#wrap {
position: relative;
min-height: 500px;
background: teal;
}
.tr {
position: absolute;
left: 0;
top: 0;
border-left: 200px solid #fff;
border-bottom: 200px solid transparent;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="wrap">
<div class="tr"></div>
</div>

To expand on web-tiki's answer, I think this is actually what you're going for:
$(document).ready(function() {
function triangle() {
$("#wrap .tr").css({
"border-left": $('#wrap').width() + "px solid #fff",
"border-bottom": "200px solid transparent"
});
}
triangle();
$(window).on('resize', triangle);
});
body {
background: #fff;
}
#wrap {
position: relative;
min-height: 500px;
background: teal;
}
.tr {
position: absolute;
left: 0;
top: 0;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="wrap">
<div class="tr"></div>
</div>

I think it would be best to use background instead of borders:
.my-triangle {
width: 100%;
height: 200px;
background: linear-gradient(to left top, transparent 50%, red 50%);
}
<div class="my-triangle"></div>
Note that in order for it to be cross-browser compatible you will need to fiddle around with CSS prefixes, IE filters and SVG. (I don't readily have access to IE so I'll leave that one for you, but it would be something along these lines:)
background-image: -webkit-gradient(linear, right bottom, left top, color-stop(0, transparent), color-stop(0.5, transparent), color-stop(0.5, #FF0000), color-stop(1, #FF0000));
background-image: -webkit-linear-gradient(bottom right, transparent 0%, transparent 50%, #FF0000 50%, #FF0000 100%);
background-image: -moz-linear-gradient(bottom right, transparent 0%, transparent 50%, #FF0000 50%, #FF0000 100%);
background-image: -ms-linear-gradient(bottom right, transparent 0%, transparent 50%, #FF0000 50%, #FF0000 100%);
background-image: -o-linear-gradient(bottom right, transparent 0%, transparent 50%, #FF0000 50%, #FF0000 100%);
background-image: linear-gradient(to top left, transparent 0%, transparent 50%, #FF0000 50%, #FF0000 100%);

Just take a div element, give a class name 'triangle-topleft', and write the below given css
.triangle-topleft {
width: 0;
height: 0;
border-top: 100px solid red;
border-right: 100px solid transparent;
}
color of border-top would be the div's background color..Here it's red.
For more triangle structures, follow this link..
[http://css-tricks.com/examples/ShapesOfCSS/][1]