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Image Background Color

Sets a checkerboard (or color) background on images viewed standalone.

Como instalar

Você precisará instalar uma extensão como Tampermonkey, Greasemonkey ou Violentmonkey para instalar este script.

Você precisará instalar uma extensão como Tampermonkey ou Violentmonkey para instalar este script.

Você precisará instalar uma extensão como Tampermonkey ou Violentmonkey para instalar este script.

Você precisará instalar uma extensão como Tampermonkey ou Userscripts para instalar este script.

Você precisará instalar uma extensão como o Tampermonkey para instalar este script.

Você precisará instalar um gerenciador de scripts de usuário para instalar este script.

(Eu já tenho um gerenciador de scripts de usuário, me deixe instalá-lo!)

Como instalar

Você precisará instalar uma extensão como o Stylus para instalar este estilo.

Você precisará instalar uma extensão como o Stylus para instalar este estilo.

Você precisará instalar uma extensão como o Stylus para instalar este estilo.

Você precisará instalar um gerenciador de estilos de usuário para instalar este estilo.

Você precisará instalar um gerenciador de estilos de usuário para instalar este estilo.

Você precisará instalar um gerenciador de estilos de usuário para instalar este estilo.

(Eu já possuo um gerenciador de estilos de usuário, me deixar fazer a instalação!) 

// ==UserScript==
// @name        Image Background Color
// @namespace   leaumar
// @match       *://*/*
// @grant       none
// @version     2
// @author      [email protected]
// @description Sets a checkerboard (or color) background on images viewed standalone.
// @license     MPL-2.0
// @icon        data:image/png;base64,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
// ==/UserScript==

const checkerBoard = {
  backgroundColor: 'darkgrey',
  backgroundImage: 'linear-gradient(45deg, grey 25%, transparent 25%, transparent 75%, grey 75%, grey), linear-gradient(45deg, grey 25%, transparent 25%, transparent 75%, grey 75%, grey)',
  backgroundPosition: '0 0, 2vmin 2vmin',
  backgroundSize: '4vmin 4vmin',
};

function setBackground(node) {
  Object.assign(node.style, checkerBoard);
  // or assign a fixed color if you want
  // node.style.backgroundColor = '#333';
}

function getStandaloneImage() {
  const tags = [...document.body.childNodes]
    .filter(node => node.nodeName !== '#text');

  return tags.length === 1 && tags[0].nodeName === 'IMG' ? tags[0] : null;
}

function clearAllBackgrounds(upFrom) {
  let current = upFrom;
  while (current?.style != null) {
    current.style.background = 'unset';
    current = current.parentNode;
  }
}

(function main() {
  const img = getStandaloneImage();
  if (img != null) {
    clearAllBackgrounds(img);
    setBackground(document.body);
  }
})();