Why Does This Calc() Function Not Work in Transform Scale

Why does this calc() function not work in transform scale?

You have two issues. The first one is about the formula without scale:

calc(0.75 + (0.3 - 0.75) * ((100vw - 320px) / (780 - 320)))

This is invalid because you are adding a number (0.75) with a length ((0.3 - 0.75) * ((100vw - 320px) / (780 - 320)))

At + or -, check that both sides have the same type, or that one side is a <number> and the other is an <integer>. If both sides are the same type, resolve to that type. If one side is a <number> and the other is an <integer>, resolve to .^ref

The second issue, is that scale only take a number so you need to correct the formula to transform the second part into a number by removing any kind of unit (vw,px,etc).

Basically, what you want to do cannot be done this way because you have no way to convert your (100vw - 320px) to a number unless you consider using some JS as this is beyond CSS. Even with JS you will need to define what is the logic behind transforming a pixel number to non-pixel number.

Using the same formula within right and with percentage will work fine because:

If percentages are accepted in the context in which the expression is placed, and they are defined to be relative to another type besides <number>, a <percentage-token> is treated as that type. For example, in the width property, percentages have the <length> type. A percentage only has the <percentage> type if in that context <percentage> values are not used-value compatible with any other type. If percentages are not normally allowed in place of the calc(), then a calc() expression containing percentages is invalid in that context.^ref

So in this case percentage is allowed to be used with right because we can resolve it thus the forumla will be valid because at the end it will be something like A% + Bpx.

Attempt to use calc() in CSS does not work

line-height: calc(1.5 * (100vw - 50px));

try this and reduce the px according to your requirement.

calc() not working with transform in Internet Explorer/Microsoft Edge

No. Since you're not even performing arithmetic with dynamic values here, just do yourself a favor and hardcode the ratio to three decimal places. Three decimal places is all the precision you need, even when taking high-resolution device displays into account.

Is it possible to use calc() inside transform:scale()?

I've decided this isn't possible with CSS (I'd love to be proven wrong), so here's a quickly-hacked together JS solution. Only works on initial page load, but it'd be trivial to add user-resizing support to it if desired.

function getContentWidth (element) {
    var styles = getComputedStyle(element)

    return element.clientWidth
      - parseFloat(styles.paddingLeft)
      - parseFloat(styles.paddingRight)
}

const scale = getContentWidth(document.getElementById('banner').parentNode) / 728;

if (scale < 1) {
    document.getElementById('banner').style.transform = 'scale(' + scale + ')';
    document.getElementById('banner').style.transformOrigin = 'left';
}

CSS3 calc() function not working correctly

You need to know that between inline and inline-block elements, the spaces matters. So if you have a whitespace between two inline elements, it takes account in the total calculation. To avoid this there are a lot of tricks, but the simplest is the following:

 .containero {
       font-size: 0;
 }

Add this property in your CSS and it works. Working example:

.containero {    font-size: 0;    width: 100%;    background-color: yellow;    display: inline-block;    box-sizing:border-box;}
.noey, .yeso {  border: 1px solid red;  width: 30px;  height: 30px;  text-align: center;  vertical-align: middle;   display:inline-block;  color: red;  padding:0px;  box-sizing:border-box;
}

.inpoot {  height: 31px;  margin: 0 5px;  display:inline-block;  width: calc(100% - 70px);  box-sizing:border-box;}

<div class="containero">  <button class="noey">No</button>  <input  class="inpoot" />  <button class="yeso">Yes</button></div>

Why the CSS calc() function is not working?

You need to add spaces between operators, it's a common mistake to forget them. We can also nest operation using calc as many as we want but they are equivalent to simple parentheses.

From the documentation:

Note: The + and - operators must be surrounded by whitespace. For
instance, calc(50% -8px) will be parsed as a percentage followed by a
negative length—an invalid expression—while calc(50% - 8px) is a
percentage followed by a subtraction operator and a length. Likewise,
calc(8px + -50%) is treated as a length followed by an addition
operator and a negative percentage.
The * and / operators do not require whitespace, but adding it for
consistency is both allowed and recommended.
Note: It is permitted to nest calc() functions, in which case the
inner ones are treated as simple parentheses.

.one {
  background: red;
  width: calc(100% - 150px);
  margin-top: calc(20px + calc(40px * 2)); /*Same as calc(20px + (40px * 2))*/
  height: calc(100px - 10px);
  padding: calc(5% + 10px) calc(5% - 5px);
}

<div class="one">

</div>

Not possible to use CSS calc() with transform:translateX in IE

This:

transform: translateX(100%) translateX(-50px);

gets compiled at parse time, but calc expression here :

transform: translateX(calc(100% - 50px));

has to be interpreted each time when browser needs that value. Result of the expression can be cached but I wouldn't rely on browsers to use such kind of optimizations.

So first one is better in the sense that a) it works now, b) is effective and c) it will work in future until the spec will be in effect.

Why Does This Calc() Function Not Work in Transform Scale