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Make resize triggers use default CSS writing mode #62

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Make resize triggers use default CSS writing mode #62

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@fred-wang
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The Chromium community is moving to scroll position values indicated in
the CSSOM specification [1]. In order to launch the feature and analyze
potential broken URLs, they count pages setting the scroll position of
a scroller in non-default writing mode to a positive value. Websites
using javascript-detect-element-resize in RTL or vertical mode appear
in the top results and cause a lot of false positives [2]. In order to
avoid that, ensure that the resize triggers use the default writing
mode (direction: ltr and writing-mode: horizontal-tb).

[1] https://www.chromestatus.com/feature/5759578031521792
[2] #61

@fred-wang
Make resize triggers use default CSS writing mode
ad48721 
The Chromium community is moving to scroll position values indicated in
the CSSOM specification [1]. In order to launch the feature and analyze
potential broken URLs, they count pages setting the scroll position of
a scroller in non-default writing mode to a positive value. Websites
using javascript-detect-element-resize in RTL or vertical mode appear
in the top results and cause a lot of false positives [2]. In order to
avoid that, ensure that the resize triggers use the default writing
mode (direction: ltr and writing-mode: horizontal-tb).

[1] https://www.chromestatus.com/feature/5759578031521792
[2] sdecima#61
@fred-wang
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I verified that the resize observer still works in different writing modes in Firefox and Chrome. I also checked that the patch avoids triggering the use counter.

Patch tested with the following:

<!DOCTYPE html>
<html>
  <head>
    <title>Detect element resize demo</title>
    <meta charset="utf-8"/>
    <script type="text/javascript" src="detect-element-resize.js"></script>
    <style>
      .resizable {
          resize: both;
          overflow: hidden;
          background: blue;
          width: 100px;
          height: 100px;
          margin: 10px;
      }
    </style>
  </head>
  <body>
    <h1>Detect element resize demo</h1>

    <div style="writing-mode: horizontal-tb">
      default: <div class="resizable"></div>
    </div>
    <div style="direction: rtl">
      rtl: <div class="resizable"></div>
    </div>
    <div style="writing-mode: vertical-rl">
      vertical-rl: <div class="resizable"></div>
    </div>
    <div style="writing-mode: vertical-lr">
      vertical-lr: <div class="resizable"></div>
    </div>

    <script type="text/javascript">
      Array.from(document.getElementsByClassName("resizable")).forEach((element) => {
          addResizeListener(element, () => {
              var rect = element.getBoundingClientRect();
              var css = window.getComputedStyle(element);
              console.log(`Writing mode: ${css.writingMode}, ${css.direction}`);
              console.log(`Size: ${rect.width}x${rect.height}`);
          });
      });
    </script>
  </body>
</html>

This was referenced Feb 15, 2020
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@fred-wang