TIL (Today I learned)

• TIL #38
  Using the background-origin property you can position background images relative to the inner border edge (default), outer border edge, or the content edge.

  

• TIL #37
  You can add the option { once: true } to an event listener to automatically remove it when has been invoked

  

• TIL #36
  The nullish coalescing operator (??) only returns its right-hand side operand when its left-hand side operand is null or undefined.

  

• TIL #35
  Optional chaining allows you to chain methods or properties, and conditionally continue down the chain if the value is not null or undefined.

  

• TIL #34
  You can use the removeProperty method to remove a specific inline CSS property defined in the style attribute.

  

• TIL #33
  There’s a space-separated syntax for values in functional color notations.

  

• TIL #32
  JSON.stringify takes 3 parameters. The third parameter can be used to pretty-print the output.

  

• TIL #31
  There's native, CSS-only smooth scrolling.

  

• TIL #30
  You can target Inverted Colors Mode mode in CSS

  

• TIL #29
  You can use JavaScript (Vibration API) to vibrate devices

  

• TIL #28
  You can disable all form elements in a fieldset by setting the disabled attribute on the fieldset.

  

• TIL #27
  You can list all pseudo elements of an element in the CSS pane in Firefox Developer Tools.

  

• TIL #26
  You can emulate dark mode and reduced motion in Chrome Dev Tools.

  

• TIL #25
  You can instruct browsers to print pages in landscape orientation (Chrome/Opera only).

  

• TIL #24
  You can change the filename of a downloadable file by defining a value in the download attribute.

  

• TIL #23
  The bullet or number of a list-item can be selected and styled with the ::marker pseudo-element.

  

• TIL #22
  If an input element has the attribute value autocomplete="new-password", browsers can suggest securely-generated passwords.

  

• TIL #21
  You can use the CSS Paint API to create background images in CSS.

  

• TIL #20
  You can search the elements panel in Developer Tools not only for strings but also selectors.

  

• TIL #19
  The webkitdirectory attribute allows users to select directories instead of files. (desktop browsers only)

  

• TIL #18
  You can do responsive preloading because preload link elements accept the media attribute like any other link element.

  

• TIL #17
  It's possible to identify how many separate fingers are touching the screen.

  

• TIL #16
  SVGs are focusable in Internet Explorer. We can set focusable="false" to prevent that.

  

• TIL #15
  macOS uses Papyrus as the default font when you define the generic font family “fantasy”.

  

• TIL #14
  text-decoration doesn't have to be a solid line. There’s also dotted, dashed, double, and wavy.

  

• TIL #13
  text-decoration is a shorthand property for text-decoration-line, text-decoration-color, and text-decoration-style.

  

• TIL #12
  Overflowing block-level elements with overflow set to scroll or auto are focusable in Firefox.

  

• TIL #11
  You can use conditional comments to target specific versions of Outlook.

  

• TIL #10
  You can turn the outline of an element to the _inside_ by setting the outline-offset property to a negative value. (Not supported in IE)

  

• TIL #9
  You can center a flex-item vertically and horizontally by applying margin: auto; to it.

  

• TIL #8
  If you press CMD/Ctrl and click on a property or property value in the style panel, @ChromeDevTools jumps directly to the respective css/scss file and line.

  

• TIL #7
  About the @at-root directive. It moves nested styles out from within a parent selector or nested directive.

  

• TIL #6
  IE 11 requires a unit to be added to the third argument (flex-basis) of the flex property.

  

• TIL #5
  You can use `navigator.connection` to get information about the connection like round-trip time, bandwidth, connection type (e.g. 3g, 4g) or if Data-Saver is enabled.

  

• TIL #4
  The grid-auto-flow property takes up to two values. row, column, dense, row dense, or column dense.

  

• TIL #3
  You can pass an `options` object, which only has a single property, to the `focus()` method to prevent scrolling on focus.

  

• TIL #2
  There’s a tab-size property. It controls the width of the tab (U+0009) character.

  

• TIL #1
  How to get a random background-color (or any other value) each time I compile Sass.