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CSS

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HTML

              
                <div class="info">You can move elements and change elements sizes using mouse.<br>Hold down SHIFT to change opposite side also.
	<span class="info-touch"><br>Please note that on touch devices resizing does not work.</span>
</div>
<div class="img"></div>
<div class="red"></div>
<div class="green"></div>
<div class="blue"></div>

              
            
!

CSS

              
                @import url(https://fonts.googleapis.com/css?family=Open+Sans:200);

html,
body {
	font-weight: 200;
	width: 100%;
	height: 100%;
	padding: 0;
	margin: 0;
	background: white;
}

.ManipulateElement {
	position: absolute;
}

.img {
	width: 100%;
	height: 100%;
	background: url(https://images.unsplash.com/photo-1556642885-60a426f7892a?ixlib=rb-1.2.1&q=85&fm=jpg&crop=entropy&cs=srgb&ixid=eyJhcHBfaWQiOjE0NTg5fQ)
		no-repeat;
	background-size: 100%;
	background-position: center;
}

@supports (-webkit-backdrop-filter: none) or (backdrop-filter: none) {
	.ManipulateElement {
		background-color: rgba(255, 255, 255, 0.3);
		backdrop-filter: blur(10px);
		-webkit-backdrop-filter: blur(10px);
	}
}

.red {
	width: 200px;
	height: 300px;
	left: 200px;
	top: 200px;
	background-color: rgba(255, 0, 0, 0.3);
}
.green {
	width: 200px;
	height: 300px;
	left: 400px;
	top: 200px;
	background-color: rgba(0, 255, 0, 0.3);
}
.blue {
	width: 200px;
	height: 300px;
	left: 600px;
	top: 200px;
	background-color: rgba(0, 0, 255, 0.3);
}

.info {
	z-index: 1000;
	position: fixed;
	top: 40px;
	padding: 10px;
	display: flex;
	text-align: center;
	justify-content: center;
	align-items: center;
	font-family: "Open Sans", sans-serif;
	font-weight: 200;
	user-select: none;
	background: hsla(0,0%,90%,.5);
}
              
            
!

JS

              
                class ManipulateElement {
  borderTresholdMax = 20;
  borderTresholdMin = 2;

  constructor(selectorOrElement) {
    this.allowNegative = true;
    this.id = parseInt(Math.random() * 10e7 + new Date().getMilliseconds(), 10);
    this.element = (typeof selectorOrElement === 'string') ? document.querySelector(selectorOrElement) : selectorOrElement;
    if (this.element) {
      this.initCSS();
      const temp = this.element.getBoundingClientRect();
      this.dimensions = {
        left: temp.left,
        top: temp.top,
        width: temp.width,
        height: temp.height
      };
      this.direction = null;
      this.mousePos = null;

      this.mouseMove.bind(this);
      this.element.addEventListener("mousemove", evt => {
				evt.preventDefault();
        this.mouseMove(evt);
      });
			this.endAltering.bind(this);
      this.element.addEventListener("touchend", this.endAltering);
      this.element.addEventListener("touchmove", evt => {
        var touch = evt.changedTouches[0];
        evt = {
          clientX: touch.clientX,
          clientY: touch.clientY,
          buttons: 1,
          shiftKey: false
        };
        this.mouseMove(evt);
				evt.preventDefault();
				return false;
      });
    } else {
      console.log(`ManipulateElement: Could not find element "${selector}"`);
    }
  }

  initCSS() {
    var isTouchDevice =
      "ontouchstart" in window ||
      navigator.MaxTouchPoints > 0 ||
      navigator.msMaxTouchPoints > 0;
    this.element.classList.add("ManipulateElement");
    let styles = document.getElementById("ManipulateElement");

    if (styles === null) {
      const temp = document.createElement("style");
      temp.setAttribute("id", "ManipulateElement");
      temp.innerHTML = `
      ${isTouchDevice ? "* { user-select: none;}" : ""}
      body.altering .ManipulateElement {
        pointer-events: none;
      }
      body.altering .ManipulateElement.not-locked {
        pointer-events: all;
      }
			.touch-device .info-touch { ${
        isTouchDevice
          ? "display: block; color: red; font-weight: bold;"
          : "display: none;"
      }}
      `;
      styles = document.body.appendChild(temp);
      document.body.classList.add("touch-device");
    }

    this.useMargin =
      ["absolute", "relative", "fixed"].indexOf(
        getComputedStyle(this.element).position.toLowerCase()
      ) === -1;
  }

  change(property, value) {
    this.element.style[property], `${value}px`;
  }

  mouseMove({ clientX, clientY, buttons, shiftKey }) {
    const BCR = this.element.getBoundingClientRect();
    const deltaX = Math.abs(clientX - BCR.x);
    const deltaY = Math.abs(clientY - BCR.y);
    const distX = BCR.width - deltaX;
    const distY = BCR.height - deltaY;

    this.direction = {
      n: deltaY < this.borderTresholdMax,
      s: distY < this.borderTresholdMax,
      w: deltaX < this.borderTresholdMax,
      e: distX < this.borderTresholdMax
    };
    const cssClass = Object.keys(this.direction).filter(
      key => this.direction[key]
    );
    
		let cursor = cssClass.join("");
		// Add the oppersite direction based on discovered direction
		switch (cursor) {
			case 'e': cursor = 'ew'; break;
			case 'w': cursor = 'ew'; break;
			case 'n': cursor = 'ns'; break;
			case 's': cursor = 'ns'; break;
			case 'ne': cursor = 'nesw'; break;
			case 'sw': cursor = 'nesw'; break;
			case 'nw': cursor = 'nwse'; break;
			case 'se': cursor = 'nwse'; break;
		}

    this.element.style.cursor = `${
      cursor ? cursor + "-resize" : buttons === 1 ? "move" : "grab"
    }`;
		
		

    if (buttons === 1) {
      document.body.classList.add("altering");
      this.element.classList.add("not-locked");
      const changeX = this.mousePos ? this.mousePos.clientX - clientX : 0;
      const changeY = this.mousePos ? this.mousePos.clientY - clientY : 0;
      this.mousePos = { clientX, clientY };
      const closeToAnEdge = Object.keys(this.direction).filter(
        key => this.direction[key]
      );
      const newHeight =
        this.dimensions.height +
        (this.direction.s ? -changeY : changeY) * (shiftKey ? 2 : 1);
      const newTop = this.dimensions.top - changeY;
      const newWidth =
        this.dimensions.width +
        (this.direction.e ? -changeX : changeX) * (shiftKey ? 2 : 1);
      const newLeft = this.dimensions.left - changeX;
      const changes = [];

      const prefix = this.useMargin ? "margin-" : "";

      if (this.direction.e) {
        if (newWidth > 0) {
          if (shiftKey) {
            this.dimensions.left = newLeft + changeX * 2;
            changes.push({
              prop: `${prefix}left`,
              value: newLeft + changeX * 2
            });
          }
          this.dimensions.width = newWidth;
          changes.push({ prop: "width", value: newWidth });
        }
      }
      if (this.direction.n) {
        if (newHeight > 0) {
          this.dimensions.height = newHeight;
          changes.push({ prop: "height", value: newHeight });
          if (this.allowNegative || newTop > 0) {
            this.dimensions.top = newTop;
            changes.push({ prop: `${prefix}top`, value: newTop });
          }
        }
      }
      if (this.direction.w) {
        if (newWidth > 0) {
          this.dimensions.width = newWidth;
          changes.push({ prop: "width", value: newWidth });

          if (this.allowNegative || newLeft > -1) {
            this.dimensions.left = newLeft;
            changes.push({ prop: `${prefix}left`, value: newLeft });
          }
        }
      }
      if (this.direction.s) {
        if (newHeight > 0) {
          if (shiftKey) {
            this.dimensions.top = newTop + changeY * 2;
            changes.push({ prop: `${prefix}top`, value: newTop + changeY * 2 });
          }
          this.dimensions.height = newHeight;
          changes.push({ prop: "height", value: newHeight });
        }
      }

      if (closeToAnEdge.length === 0) {
        // Move rectangle
        const newLeft = this.dimensions.left - changeX;
        if (this.allowNegative || newLeft > -1) {
          this.dimensions.left = newLeft;
          changes.push({ prop: `${prefix}left`, value: newLeft });
        }
        if (this.allowNegative || newTop > -1) {
          this.dimensions.top = newTop;
          changes.push({ prop: `${prefix}top`, value: newTop });
        }
      }
      const element = this;
      changes.forEach(change => {
        this.element.style[change.prop] = `${change.value}px`;
      });
    } else {
      this.endAltering();
    }

    this.mousePos = { clientX, clientY };
  }

  endAltering() {
    document.body.classList.remove("altering");
    this.element.classList.remove("not-locked");
  }
}

const red = new ManipulateElement(".red");
const green = new ManipulateElement(".green");
const blue = new ManipulateElement(".blue");
const img = new ManipulateElement(".img");
const info = new ManipulateElement(document.querySelector(".info"));

              
            
!
999px

Console