Deciphering the :host attribute in CSS: A guide

When using Selenium to query the CSS properties of an element, I noticed that even though the actual background color is white, the returned value for background-color is always #000000. This issue arises in an Ionic-built app.

Upon inspecting with Chrome DevTools, I discovered that --background: #fff; is what I actually need. However, I am unsure how to query the host property as it seems unfamiliar to me.

:host {
    --background: #fff;
    --color: #000;
    --padding-top: 0px;
    --padding-bottom: 0px;
    --padding-start: 0px;
    --padding-end: 0px;
    --keyboard-offset: 0px;
    --offset-top: 0px;
    --offset-bottom: 0px;
    --overflow: auto;
    display: block;
    position: relative;
    width: 100%;
    height: 100%;
    font-family: var(--ion-font-family,inherit);
    contain: size style;
    flex: 1 1 0%;
    margin: 0px !important;
    padding: 0px !important;
}

The code functions correctly but does not retrieve the correct background color.

String bgColor = Color.fromString(webElement.getCssValue("background-color")).asHex();

Answer №1

This script loops through all your CSS rules and extracts the value of the variable --background within :host selector. Feel free to customize it according to your needs.

  for(const sheet of document.styleSheets) {
    for(const rule of sheet.rules) {
      if(rule.selectorText==":host") {
        console.log(rule.style.getPropertyValue('--background'));
      }
    }
  }

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