A place to cache linked articles (think custom and personal wayback machine)
Vous ne pouvez pas sélectionner plus de 25 sujets Les noms de sujets doivent commencer par une lettre ou un nombre, peuvent contenir des tirets ('-') et peuvent comporter jusqu'à 35 caractères.

index.html 11KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184
  1. <!doctype html><!-- This is a valid HTML5 document. -->
  2. <!-- Screen readers, SEO, extensions and so on. -->
  3. <html lang="fr">
  4. <!-- Has to be within the first 1024 bytes, hence before the `title` element
  5. See: https://www.w3.org/TR/2012/CR-html5-20121217/document-metadata.html#charset -->
  6. <meta charset="utf-8">
  7. <!-- Why no `X-UA-Compatible` meta: https://stackoverflow.com/a/6771584 -->
  8. <!-- The viewport meta is quite crowded and we are responsible for that.
  9. See: https://codepen.io/tigt/post/meta-viewport-for-2015 -->
  10. <meta name="viewport" content="width=device-width,initial-scale=1">
  11. <!-- Required to make a valid HTML5 document. -->
  12. <title>Why light text on dark background is a bad idea (archive) — David Larlet</title>
  13. <meta name="description" content="Publication mise en cache pour en conserver une trace.">
  14. <!-- That good ol' feed, subscribe :). -->
  15. <link rel="alternate" type="application/atom+xml" title="Feed" href="/david/log/">
  16. <!-- Generated from https://realfavicongenerator.net/ such a mess. -->
  17. <link rel="apple-touch-icon" sizes="180x180" href="/static/david/icons2/apple-touch-icon.png">
  18. <link rel="icon" type="image/png" sizes="32x32" href="/static/david/icons2/favicon-32x32.png">
  19. <link rel="icon" type="image/png" sizes="16x16" href="/static/david/icons2/favicon-16x16.png">
  20. <link rel="manifest" href="/static/david/icons2/site.webmanifest">
  21. <link rel="mask-icon" href="/static/david/icons2/safari-pinned-tab.svg" color="#07486c">
  22. <link rel="shortcut icon" href="/static/david/icons2/favicon.ico">
  23. <meta name="msapplication-TileColor" content="#f7f7f7">
  24. <meta name="msapplication-config" content="/static/david/icons2/browserconfig.xml">
  25. <meta name="theme-color" content="#f7f7f7" media="(prefers-color-scheme: light)">
  26. <meta name="theme-color" content="#272727" media="(prefers-color-scheme: dark)">
  27. <!-- Documented, feel free to shoot an email. -->
  28. <link rel="stylesheet" href="/static/david/css/style_2021-01-20.css">
  29. <!-- See https://www.zachleat.com/web/comprehensive-webfonts/ for the trade-off. -->
  30. <link rel="preload" href="/static/david/css/fonts/triplicate_t4_poly_regular.woff2" as="font" type="font/woff2" media="(prefers-color-scheme: light), (prefers-color-scheme: no-preference)" crossorigin>
  31. <link rel="preload" href="/static/david/css/fonts/triplicate_t4_poly_bold.woff2" as="font" type="font/woff2" media="(prefers-color-scheme: light), (prefers-color-scheme: no-preference)" crossorigin>
  32. <link rel="preload" href="/static/david/css/fonts/triplicate_t4_poly_italic.woff2" as="font" type="font/woff2" media="(prefers-color-scheme: light), (prefers-color-scheme: no-preference)" crossorigin>
  33. <link rel="preload" href="/static/david/css/fonts/triplicate_t3_regular.woff2" as="font" type="font/woff2" media="(prefers-color-scheme: dark)" crossorigin>
  34. <link rel="preload" href="/static/david/css/fonts/triplicate_t3_bold.woff2" as="font" type="font/woff2" media="(prefers-color-scheme: dark)" crossorigin>
  35. <link rel="preload" href="/static/david/css/fonts/triplicate_t3_italic.woff2" as="font" type="font/woff2" media="(prefers-color-scheme: dark)" crossorigin>
  36. <script>
  37. function toggleTheme(themeName) {
  38. document.documentElement.classList.toggle(
  39. 'forced-dark',
  40. themeName === 'dark'
  41. )
  42. document.documentElement.classList.toggle(
  43. 'forced-light',
  44. themeName === 'light'
  45. )
  46. }
  47. const selectedTheme = localStorage.getItem('theme')
  48. if (selectedTheme !== 'undefined') {
  49. toggleTheme(selectedTheme)
  50. }
  51. </script>
  52. <meta name="robots" content="noindex, nofollow">
  53. <meta content="origin-when-cross-origin" name="referrer">
  54. <!-- Canonical URL for SEO purposes -->
  55. <link rel="canonical" href="https://tatham.blog/2008/10/13/why-light-text-on-dark-background-is-a-bad-idea/">
  56. <body class="remarkdown h1-underline h2-underline h3-underline em-underscore hr-center ul-star pre-tick" data-instant-intensity="viewport-all">
  57. <article>
  58. <header>
  59. <h1>Why light text on dark background is a bad idea</h1>
  60. </header>
  61. <nav>
  62. <p class="center">
  63. <a href="/david/" title="Aller à l’accueil"><svg class="icon icon-home">
  64. <use xlink:href="/static/david/icons2/symbol-defs-2021-12.svg#icon-home"></use>
  65. </svg> Accueil</a> •
  66. <a href="https://tatham.blog/2008/10/13/why-light-text-on-dark-background-is-a-bad-idea/" title="Lien vers le contenu original">Source originale</a>
  67. </p>
  68. </nav>
  69. <hr>
  70. <p><strong>Update, Oct 2014:</strong> This post was written in 2008, based on me scrounging together some complementary links at the time. It’s now 2014, and accessibility is a well thought-out problem, which is generally well solved. Use the colour scheme that makes you happy. I use a black background on my Windows Phone, a dark navy in Sublime Text, a mid-grey chrome around my Office documents, and a bright white background through Outlook and my email.</p>
  71. <hr>
  72. <p>As this is a suggestion which comes up quite regularly, I felt it valuable to document some of the research I have collected about the readability of light text on dark backgrounds.</p>
  73. <p>The science of readability is by no means new, and some of the best research comes from advertising works in the early 80s. This information is still relevant today.</p>
  74. <p>First up is this quote from a paper titled “Improving the legibility of visual display units through contrast reversal”. In present time we think of contrast reversal meaning black-on-white, but remember this paper is from 1980 when VDUs (monitors) where green-on-black. This paper formed part of the research that drove the push for this to change to the screen formats we use today.</p>
  75. <blockquote><p>However, most studies have shown that dark characters on a light background are superior to light characters on a dark background (when the refresh rate is fairly high). For example, Bauer and Cavonius (1980) found that participants were 26% more accurate in reading text when they read it with dark characters on a light background.</p>
  76. <p>Reference: Bauer, D., &amp; Cavonius, C., R. (1980). Improving the legibility of visual display units through contrast reversal. In E. Grandjean, E. Vigliani (Eds.), Ergonomic Aspects of Visual Display Terminals (pp. 137-142). London: Taylor &amp; Francis</p></blockquote>
  77. <p>Ok, 26% improvement – but why?</p>
  78. <blockquote><p>People with astigmatism (aproximately 50% of the population) find it harder to read white text on black than black text on white. Part of this has to do with light levels: with a bright display (white background) the iris closes a bit more, decreasing the effect of the “deformed” lens; with a dark display (black background) the iris opens to receive more light and the deformation of the lens creates a much fuzzier focus at the eye.</p>
  79. <p><a href="http://www.cs.ubc.ca/labs/spin/people/harrison-jason.html" target="_blank">Jason Harrison</a> – Post Doctoral Fellow, Imager Lab Manager – Sensory Perception and Interaction Research Group, University of British Columbia</p></blockquote>
  80. <p>The “fuzzing” effect that Jason refers to is known as halation.</p>
  81. <p>It might feel strange pushing your primary design goals based on the vision impaired, but when 50% of the population of have this “impairment” it’s actually closer to being the norm than an impairment.</p>
  82. <p>The web is rife with research on the topic, but I think these two quotes provide a succinct justification for why light text on a dark background is a bad idea.</p>
  83. </article>
  84. <hr>
  85. <footer>
  86. <p>
  87. <a href="/david/" title="Aller à l’accueil"><svg class="icon icon-home">
  88. <use xlink:href="/static/david/icons2/symbol-defs-2021-12.svg#icon-home"></use>
  89. </svg> Accueil</a> •
  90. <a href="/david/log/" title="Accès au flux RSS"><svg class="icon icon-rss2">
  91. <use xlink:href="/static/david/icons2/symbol-defs-2021-12.svg#icon-rss2"></use>
  92. </svg> Suivre</a> •
  93. <a href="http://larlet.com" title="Go to my English profile" data-instant><svg class="icon icon-user-tie">
  94. <use xlink:href="/static/david/icons2/symbol-defs-2021-12.svg#icon-user-tie"></use>
  95. </svg> Pro</a> •
  96. <a href="mailto:david%40larlet.fr" title="Envoyer un courriel"><svg class="icon icon-mail">
  97. <use xlink:href="/static/david/icons2/symbol-defs-2021-12.svg#icon-mail"></use>
  98. </svg> Email</a> •
  99. <abbr class="nowrap" title="Hébergeur : Alwaysdata, 62 rue Tiquetonne 75002 Paris, +33184162340"><svg class="icon icon-hammer2">
  100. <use xlink:href="/static/david/icons2/symbol-defs-2021-12.svg#icon-hammer2"></use>
  101. </svg> Légal</abbr>
  102. </p>
  103. <template id="theme-selector">
  104. <form>
  105. <fieldset>
  106. <legend><svg class="icon icon-brightness-contrast">
  107. <use xlink:href="/static/david/icons2/symbol-defs-2021-12.svg#icon-brightness-contrast"></use>
  108. </svg> Thème</legend>
  109. <label>
  110. <input type="radio" value="auto" name="chosen-color-scheme" checked> Auto
  111. </label>
  112. <label>
  113. <input type="radio" value="dark" name="chosen-color-scheme"> Foncé
  114. </label>
  115. <label>
  116. <input type="radio" value="light" name="chosen-color-scheme"> Clair
  117. </label>
  118. </fieldset>
  119. </form>
  120. </template>
  121. </footer>
  122. <script src="/static/david/js/instantpage-5.1.0.min.js" type="module"></script>
  123. <script>
  124. function loadThemeForm(templateName) {
  125. const themeSelectorTemplate = document.querySelector(templateName)
  126. const form = themeSelectorTemplate.content.firstElementChild
  127. themeSelectorTemplate.replaceWith(form)
  128. form.addEventListener('change', (e) => {
  129. const chosenColorScheme = e.target.value
  130. localStorage.setItem('theme', chosenColorScheme)
  131. toggleTheme(chosenColorScheme)
  132. })
  133. const selectedTheme = localStorage.getItem('theme')
  134. if (selectedTheme && selectedTheme !== 'undefined') {
  135. form.querySelector(`[value="${selectedTheme}"]`).checked = true
  136. }
  137. }
  138. const prefersColorSchemeDark = '(prefers-color-scheme: dark)'
  139. window.addEventListener('load', () => {
  140. let hasDarkRules = false
  141. for (const styleSheet of Array.from(document.styleSheets)) {
  142. let mediaRules = []
  143. for (const cssRule of styleSheet.cssRules) {
  144. if (cssRule.type !== CSSRule.MEDIA_RULE) {
  145. continue
  146. }
  147. // WARNING: Safari does not have/supports `conditionText`.
  148. if (cssRule.conditionText) {
  149. if (cssRule.conditionText !== prefersColorSchemeDark) {
  150. continue
  151. }
  152. } else {
  153. if (cssRule.cssText.startsWith(prefersColorSchemeDark)) {
  154. continue
  155. }
  156. }
  157. mediaRules = mediaRules.concat(Array.from(cssRule.cssRules))
  158. }
  159. // WARNING: do not try to insert a Rule to a styleSheet you are
  160. // currently iterating on, otherwise the browser will be stuck
  161. // in a infinite loop…
  162. for (const mediaRule of mediaRules) {
  163. styleSheet.insertRule(mediaRule.cssText)
  164. hasDarkRules = true
  165. }
  166. }
  167. if (hasDarkRules) {
  168. loadThemeForm('#theme-selector')
  169. }
  170. })
  171. </script>
  172. </body>
  173. </html>