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Showing content from https://developer.mozilla.org/en-US/docs/Web/CSS/reading-flow below:

reading-flow - CSS | MDN

/* Keyword values */
reading-flow: normal;
reading-flow: flex-visual;
reading-flow: flex-flow;
reading-flow: grid-columns;
reading-flow: grid-rows;
reading-flow: grid-order;
reading-flow: source-order;

/* Global values */
reading-flow: inherit;
reading-flow: initial;
reading-flow: revert;
reading-flow: revert-layer;
reading-flow: unset;

Value

The reading-flow property takes one of the following keywords as its value:

normal: The default value. The reading order follows the order of elements in the DOM.
flex-visual: Only affects flex containers. The reading order follows the visual order of the flex items, taking the writing-mode into account. Therefore, a document in English with flex-direction: row-reverse and reading-flow: flex-visual set would have a reading order of left-to-right.
flex-flow: Only affects flex containers. The reading order follows the flex-flow direction.
grid-columns: Only affects grid containers. The reading order follows the visual order of grid items, column by column, taking the writing mode into account.
grid-rows: Only affects grid containers. The reading order follows the visual order of grid items, row by row, taking the writing mode into account.
grid-order: Only affects grid containers. if the order property is applied to any of the container's children, the reading order follows the modified item order. If the order property is not applied to the grid items, grid-order behaves as normal.
source-order: Affects grid, flex, and block containers. Has no effect on its own â the container's reading order continues to follow the order of elements in the DOM â but allows the reading order to be modified by setting the reading-order property on the container's children.

Description

The reading-flow property modifies the reading order of elements within a block, flex, or grid container when set to a value other than normal. Such a container is referred to as a reading flow container.

By default, web content is read out in DOM source order. Generally, the source order should express a sensible reading order for the content, and this should also be reflected by the visual order in the content layout. However, sometimes the visual order or tab order differs from the source order. For example, when applying multiple flexbox or grid layouts to a document via media queries to suit different device or user requirements, the content order may differ based on the viewport width. In such a case, the reading-flow can be used to ensure the reading and tabbing order reflect the visual order.

In some cases you may wish to further fine-tune the reading order within a reading flow container. You can use reading-order property values on the container's children, putting them into ordinal groups which are then read out in numerical order.

Interaction with tabindex

If a set of reading flow container child elements that are not normally focusable are made focusable with tabindex="0" attributes, their reading order will be modified as expected by the reading-flow and reading-order properties, in just the same way as interactive elements such as <a> or <button>.

However, any attempt to modify the tabbing order of a reading flow container's content using positive tabindex values will be ignored â overridden by the effects of reading-flow and reading-order. You generally shouldn't be using these anyway; see Don't Use Tabindex Greater than 0. The reading-flow and reading-order properties provide a much better way to modify tabbing order if required.

Formal definitionValue not found in DB! Examples Flex value comparison

In this example, we demonstrate the effects of different reading-flow values on a flex container with reversed flex items.

HTML

The markup includes a <select> element for selecting different reading-flow values, and a wrapper <div> containing three <a> elements.

<form>
  <label for="reading-flow">Choose reading flow:</label>
  <select id="reading-flow">
    <option>normal</option>
    <option>flex-visual</option>
    <option>flex-flow</option>
  </select>
</form>
<div class="wrapper">
  <a href="#">Item 1</a>
  <a href="#">Item 2</a>
  <a href="#">Item 3</a>
</div>

CSS

We use a display value of flex to turn the <div> into a flex container, and display the flex items in a row in reverse DOM order with a flex-direction value of row-reverse. Initially, we set a reading-flow of normal so the items are read or tabbed through in DOM source order.

We also set an order value of 1 on the first <a> element to cause it to display after the second and third item in the flex flow. The resulting visual order of the flex items from left to right is "Item 1", "Item 3", then "Item 2", but the DOM order remains unchanged.

.wrapper {
  display: flex;
  flex-direction: row-reverse;
  reading-flow: normal;
  gap: 1em;
}

a:first-child {
  order: 1;
}

JavaScript

In our script, we grab references to the <select> element and wrapper <div>, then add a change event listener to the <select> element. When a new value is selected, it is set as a reading-flow property value on the wrapper.

const selectElem = document.getElementById("reading-flow");
const wrapperElem = document.querySelector(".wrapper");

selectElem.addEventListener("change", () => {
  wrapperElem.style.readingFlow = selectElem.value;
});

Result

The demo renders like this:

First, try tabbing through the links with reading-flow: normal set. The tabbing order is "Item 1", "Item 2", then "Item 3", as that is the order of the elements in the DOM.

Now try changing the reading-flow value and tabbing through the links again:

A value of flex-visual causes the items to be tabbed through in the order "Item 1", "Item 3", then "Item 2", which is the visual display order resulting from the applied flexbox properties.
A value of flex-flow causes the items to be tabbed through in the order "Item 2", "Item 3", then "Item 1", which matches the direction of the flex-flow â in this case, row-reverse. Here, the tabbing order is the reverse of the display order.

Grid value comparison

In this example, we demonstrate the effects of different reading-flow values on a grid container.

HTML

The markup includes a <select> element for selecting different reading-flow values, and a wrapper <div> containing four <a> elements.

<form>
  <label for="reading-flow">Choose reading flow:</label>
  <select id="reading-flow">
    <option>normal</option>
    <option>grid-rows</option>
    <option>grid-columns</option>
    <option>grid-order</option>
  </select>
</form>
<div class="wrapper">
  <a class="a" href="#">Item A</a>
  <a class="b" href="#">Item B</a>
  <a class="c" href="#">Item C</a>
  <a class="d" href="#">Item D</a>
</div>

CSS

We use a display value of grid to turn the <div> into a grid container, and display the grid items in three columns using grid-template-columns. We also set grid-template-areas to describe different placement areas in those columns, and place the <a> elements in those areas using grid-area. Initially, we set a reading-flow of normal so the items are read or tabbed through in the default DOM source order.

Finally, we set an order value of 1 on the first <a> element; this has no effect on the layout because it does not override the grid area placement, but it does have an effect when a certain reading-flow value is set, as you'll se later on.

Reading from left to right, the resulting display order of the grid items is "Item D", "Item B", "Item C", then "Item A".

.wrapper {
  display: grid;
  grid-template-columns: repeat(3, 150px);
  grid-template-areas:
    "d b b"
    "c c a";
  reading-flow: normal;
}

.a {
  grid-area: a;
}
.b {
  grid-area: b;
}
.c {
  grid-area: c;
}
.d {
  grid-area: d;
}

a:first-child {
  order: 1;
}

JavaScript

const selectElem = document.getElementById("reading-flow");
const wrapperElem = document.querySelector(".wrapper");

selectElem.addEventListener("change", () => {
  wrapperElem.style.readingFlow = selectElem.value;
});

Result

The demo renders like this:

First, try tabbing through the links with reading-flow: normal set. The tabbing order is "Item A", "Item B", "Item C", and "Item D", as that is the order of the elements in the DOM.

Now change the reading-flow value and then try tabbing through the links again:

A value of grid-rows causes the items to be tabbed through in the visual display order by row. This is "Item D", "Item B", "Item C", then "Item A".
A value of grid-columns causes the items to be tabbed through in the visual display order by column. This is "Item D", "Item C", "Item B", then "Item A".
A value of grid-order causes the items to be tabbed through in DOM order, but takes into account any order value changes. Since we have order: 1; set on the first <a> element, the tabbing order is "Item B", "Item C", "Item D", then "Item A".

Reading order adjustment on block containers

In this example, we demonstrate the effects of the reading-flow: source-order value on a block container.

HTML

The markup includes a wrapper <div> containing four <a> elements.

<div class="wrapper">
  <a class="a" href="#">Item A</a>
  <a class="b" href="#">Item B</a>
  <a class="c" href="#">Item C</a>
  <a class="d" href="#">Item D</a>
</div>

CSS

We set a reading-flow of source-order so the items are read or tabbed through in DOM source order, but modifications are allowed to the reading order via reading-order. We set a reading-order value of 1 on the first <a> element.

.wrapper {
  reading-flow: source-order;
}

a:first-child {
  reading-order: 1;
}

Result

The demo renders like this:

Try tabbing through the links: the tabbing order is "Item B", "Item C", "Item D", then "Item A" â the order of the elements in the DOM is followed, but Item A has been put in a higher reading order ordinal group than the others (the default reading-order value is 0), therefore it is tabbed to last.

Specifications Browser compatibility

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