
To style a Tableau HTML, you need to understand the basics of HTML and CSS. HTML is used to define the structure of the webpage, while CSS is used for styling.
A good starting point is to use a CSS framework like Bootstrap, which provides pre-designed styles for common UI elements. This can save you a lot of time and effort in designing your Tableau HTML.
Tableau HTML uses a combination of HTML and CSS to create a responsive design. By using CSS media queries, you can define different styles for different screen sizes and devices.
For example, you can use the following CSS code to make a button responsive: `@media (max-width: 768px) { .btn { padding: 10px; } }`. This code applies a different style to the button when the screen size is less than 768 pixels.
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Applying CSS Classes
You can apply CSS classes to HTML elements to style them, just like you would in a regular HTML page. This can greatly improve the appearance of your tables.
To apply the formatting in the body of your HTML page to HTML elements, use the string literal tableau-*. For example, to apply the worksheet title formatting, set the class for the HTML element in your extension (h1, h2, etc.) to "tableau-worksheet-title".
The specific Tableau classes to use are defined in the ClassNameKey enum, which includes classes like tableau-dashboard-title, tableau-story-title, and tableau-tooltip. You can find the full list of classes in the ClassNameKey enum.
Here's a list of Tableau classes you can use to apply formatting styles:
With these classes, you can easily apply the formatting styles to your HTML elements and make your tables look great.
Table Properties and Styles
Table properties and styles can be controlled using both HTML and CSS. You can define the border thickness of a table using the border property in HTML.
The border property is expressed in pixels, but you can simply declare the value without the unit, as it's implicit and known by the browser.
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You can also control the table's width and height using the width and height properties, respectively. The width property can be expressed in pixels or as a percentage, while the height property should be avoided unless necessary.
For instance, if you want to set the width of a table to 500 pixels, you can simply use the value 500 without the unit. If you want to set the width to 50% of the parent element, you can use the value 50% with the unit.
Here are some common table properties:
- border: defines the border thickness of the table (and its cells)
- width: defines the table's width in pixels or percentage
- height: defines the table's height in pixels, but it's generally better to avoid this property
- bgcolor: defines the table's background color, expressed in English name or color code
- cellspacing: defines the space between table cells, expressed in pixels (implicit)
- cellpadding: defines the internal margin of table cells, expressed in pixels (implicit)
Vertical Align Table Cells
Vertical alignment of table cells is a crucial aspect of making your tables look professional and easy to read. You can control the vertical alignment of table cell content using the CSS property `vertical-align`.
You can pass a value of type length (in pixels or em, for example), a percentage value, or a keyword to this property. In most cases, you'll choose from one of three keyword values: `top`, `middle`, or `bottom`.
The `top` value places the content at the top of the cell, while `bottom` places it at the bottom. `middle` is the default value, which centers the content vertically within the cell.
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Création de Zébrés
Zébrer une table est une technique courante pour améliorer la lisibilité des tableaux contenant une grande quantité de données.
La définition de différentes couleurs d'arrière-plan pour les lignes alternées est une technique courante.
Vous pouvez obtenir cet effet en utilisant le sélecteur pseudo-classe de CSS :nth-child().
La pseudo-classe :nth-child() sélectionne des éléments en fonction de leur position dans un groupe de frères et sœurs.
Il peut prendre un nombre, un mot-clé pair(even) ou impair(odd), ou une expression de la forme xn+y comme argument.
Les règles de style suivantes mettront en évidence toutes les lignes impaires dans le corps du tableau.
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Table Layout and Design
Table layout and design are crucial elements in creating a visually appealing HTML table. With CSS, you can greatly improve the appearance of your tables.
You can use CSS to control the disposition and presentation of table elements, making your tables look elegant and consistent. This is especially important when you want to create a professional-looking table.
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The table-layout property allows you to manage the width of your table's columns. You can choose between two values: auto and fixed.
Here are the two values and what they mean:
- auto: This is the default value, where the width of each column is calculated automatically to take up the least amount of space possible.
- fixed: This value determines the width of columns based on the width property of table elements, or the first row of the table.
By choosing the right table layout and design, you can make your tables more readable and user-friendly.
Table Structure and Content
In a Style Tableau HTML project, the table structure is crucial for effective data presentation. A well-structured table can make a big difference in how easily users can understand and interact with the data.
The table header is typically defined using the `` element, which is a child of the `` element. This is shown in the example where the table header is defined with `Year` and `Revenue`.
The table body is defined using the `` element, and each row in the table is also a child of the `` element. This is demonstrated in the example where each row is defined with `...`.
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Workbook Info Access

Accessing workbook information is crucial in understanding the structure and content of a Tableau workbook. You can access the formatting used in a Tableau workbook from the tableau.extensions.environment.workbookFormatting property.
The workbookFormatting property contains an array of CSS properties for the workbook, organized by ClassNameKey. This array can be navigated using the Chrome DevTools.
To view the formatting styles available, you could add the following JavaScript code and then view the results in the Console window by navigating the array.
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Affichage des cellules vides
Les cellules vides d'un tableau peuvent être un peu gênantes, mais heureusement, CSS nous offre une solution pour les rendre plus visibles ou les cacher. La propriété empty-cells nous permet de choisir si l'arrière-plan et les bordures d'une cellule sans contenu doivent être affichés ou pas.
La valeur par défaut de empty-cells est show, ce qui signifie que les bordures et l'arrière-plan des cellules vides du tableau seront bien visibles.
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Pour cacher les bordures et l'arrière-plan des cellules vides, vous pouvez définir empty-cells à hide.
Notez que cette propriété ne fonctionne que si la valeur de la propriété border-collapse pour le tableau est separate.
Voici les valeurs possibles pour empty-cells :
- show : Valeur par défaut ; les bordures et l’arrière-plan des cellules vides du tableau seront bien visibles ;
- hide : Les bordures et l’arrière-plan des cellules vides du tableau ne sont pas affichés.
Balise Table
The Balise Table is a fundamental element in HTML that helps organize content in a structured and easy-to-read format.
The border attribute defines the thickness of the table border and its cells, expressed in pixels. We simply declare the value without the unit, as it's implied and known by the browser.
The width attribute determines the table's width, which can be expressed in pixels or as a percentage. If we're using pixels, we omit the unit, while percentages require the symbol %.
It's generally recommended to avoid specifying the height attribute, as this can restrict the table's ability to adapt to its content's size.
The bgcolor attribute sets the background color of the table, which can be expressed using English names or color codes.
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The cellspacing attribute, which is implied in pixels, controls the spacing between table cells.
The cellpadding attribute, also implied in pixels, defines the internal margin of table cells.
Here's a quick summary of the main attributes for the Balise Table:
- border: définit l'épaisseur de la bordure du tableau (et de ses cellules)
- width: définit la largeur du tableau
- bgcolor: désigne la couleur de l'arrière plan du tableau
- cellspacing: signifie l'espacement entre les différentes cellules du tableau
- cellpadding: définit la marge interne des cellules
Attribut Colspan
The Colspan attribute is used to span multiple columns in a table. It allows a table cell to take up more than one column in a table.
The colspan attribute can be used in conjunction with the rowspan attribute to create complex table structures. In our example table, the header cell spans two columns using the colspan attribute.
By using the colspan attribute, we can create tables that are easy to read and understand. The table on the right shows a table with a header row and a single cell that spans two columns.
The value of the colspan attribute specifies how many columns the cell should span. In our example, the header cell spans 2 columns.
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Styling and Formatting
Styling and formatting a table in HTML is a crucial aspect of web development. You can greatly improve the appearance of your tables using CSS.
To add borders to your table, you can use the CSS property border-collapse. For example, you can set border-collapse to collapse to merge the different borders into one. This will help harmonize the entire table.
The CSS property border-collapse is a great alternative to using HTML attributes like border, cellpadding, and cellspacing. These attributes are deprecated and should not be used for styling tables.
With CSS, you can also modify the background color of your table or individual cells. For instance, you can use the CSS property background-color to change the background color of a specific cell. This is a more efficient and flexible way to style your tables compared to using HTML attributes.
Here are some common CSS properties used for styling tables:
- border-collapse
- border-spacing
- caption-side
- empty-cells
- table-layout
- vertical-align
These CSS properties will help you create visually appealing and well-structured tables that enhance the user experience.
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Attributs vs CSS
Styling and formatting can make or break the user experience of a website. A well-designed table can convey complex information in a clear and concise manner, but it requires the right tools.
In the past, we used to rely on HTML attributes to style our tables, but that's no longer the case. These attributes are now deprecated and should never be used.
Some common HTML attributes used for table styling were align, bgcolor, border, cellpadding, cellspacing, char, charoff, frame, rules, summary, and valign. These attributes are no longer supported and should be avoided.
CSS offers much better alternatives for styling tables, providing more flexibility and better support. With CSS, we can add borders around each cell, merge them into a single border, and even change the background color of the table or individual cells.
Here are some key CSS properties for styling tables: border-collapse, border-spacing, caption-side, empty-cells, table-layout, and vertical-align.
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Style Tables with CSS
Styling tables with CSS is a game-changer for making your data look professional and visually appealing. You can greatly improve the appearance of your tables by using CSS.
CSS provides several properties that allow you to control the layout and presentation of table elements. By applying CSS styles, you can create elegant and consistent tables. In fact, CSS is a much better alternative to using outdated HTML attributes to style tables.
You can add borders around each cell of your table by applying the `border` property to your `td` elements, and then merge the different borders into one by applying `border-collapse: collapse` to your `table` element.
To modify the background color of your table or a specific element within it, you can use CSS. This is a much more efficient and flexible way to style your tables compared to using HTML attributes.
Some common CSS properties for styling tables include `border-collapse`, `border-spacing`, `caption-side`, `empty-cells`, `table-layout`, and `vertical-align`. These properties offer a wide range of possibilities for customizing the appearance of your tables.
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You can use the `vertical-align` property to align the content of your table cells vertically. This property can take a value of a length (in pixels or ems, for example), a percentage value, or one of the following keywords: `top`, `middle`, or `bottom`. In most cases, you'll stick with one of these three keywords.
Here are some common values for the `vertical-align` property:
To add more space between the content of your table cells and their borders, you can use the `padding` property. This property adds space between the content and the border of each cell. You can also adjust the spacing between the borders of your cells using the `border-spacing` property, if your table borders are separated (which is the default behavior).
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Table Size and Position
Table size and position can be controlled using various attributes. The border attribute defines the thickness of the table border and its cells, with a value expressed in pixels.
You can also use the width attribute to set the table's width, which can be expressed in pixels or as a percentage. If you choose pixels, simply state the value without the unit, as it's implicit. For example, width="500" means 500 pixels.
To adjust the table's height, use the height attribute. However, it's generally better to omit this attribute and let the table expand to fit its content. The bgcolor attribute sets the table's background color, using either a color name or a color code.
Here are the table size and position attributes in a concise list:
- border: définit l’épaisseur de la bordure du tableau (et de ses cellules)
- width: définit la largeur du tableau
- height: définit la hauteur du tableau
- bgcolor: désigne la couleur de l'arrière plan du tableau
Adjust Table Size
Adjusting the size of a table can be a bit tricky, but don't worry, I've got you covered. You can define the table's width and height using the CSS properties width and height.
By default, a table will be just wide and tall enough to fit its content. However, you can also set the table's width and height explicitly, as well as those of its cells, using the width and height properties.
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If you want to set the table's width, you can do so by specifying a value in pixels or as a percentage. For example, you can set the table's width to 100% to make it full-width.
The table's height can also be set, but it's generally a good idea to leave it unset and let the table expand to fit its content. However, if you need to set a height, you can do so in pixels.
Here are the table attributes related to size:
Control of Position
You can control the position of the table legend by using the caption-side property. This property allows you to choose where the legend should be displayed, either above or below the table.
To place the legend below the table, you can simply use the value "bottom".
The default position of the legend is above the table, so if you don't specify a value, it will be placed there.
Here's a summary of the possible values for caption-side:
By controlling the position of the legend, you can create a more visually appealing and organized table.
Text Alignment and Legend
Text alignment in HTML tables is a crucial aspect of making your data look clean and organized. You can align the content of your table cells horizontally or vertically.
To align text horizontally, you can use the text-align property, just like you would with other elements. This allows you to align text to the left, right, center, or justify.
By default, text within elements is aligned to the left, while text within elements is centered and bold.
The position of the table legend can also be controlled, and it can be placed either at the top or bottom of the table. The default position is at the top.
To change the alignment of the table legend's text, you can use the text-align property, just as you would with regular text.
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Legend and Border Control
The position of a table legend can be adjusted to either the top or bottom of the table, with the default being at the top. You can change this by modifying the CSS properties.

For a more customized look, you can also use the CSS text-align property to adjust the horizontal alignment of the legend text, just like you would with regular text.
To improve the readability of a table with a lot of data, consider using a striped effect by alternating the background color of the rows. This can be achieved using the :nth-child() pseudo-class in CSS, which selects elements based on their position in a group of siblings.
Border-Collapse et Border-Spacing
La propriété border-collapse est utilisée pour définir si les bordures des cellules de tableau adjacentes doivent être fusionnées ou rester distinctes. La valeur par défaut est separate, ce qui signifie que chaque cellule a ses propres bordures distinctes.
Pour fusionner les bordures, vous pouvez définir la valeur de border-collapse sur collapse. Cela signifie que les cellules de tableau adjacentes partageront une bordure commune.
Vous pouvez également utiliser la propriété border-spacing pour gérer la distance entre les bordures. Indiquer une valeur de 0px ne supprimera pas les bordures, mais simplement collera les bordures des cellules adjacentes.
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Voici les valeurs possibles pour la propriété border-collapse :
- separate : Valeur par défaut ; les bordures seront séparées et distinctes ;
- collapse : Les bordures adjacentes vont être fusionnées.
La propriété border-collapse doit être appliquée à l'élément table, tandis que la propriété border-spacing doit être appliquée à l'élément table pour gérer la distance entre les bordures.
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Choisir la position de la légende
Choosing the position of a legend is a crucial aspect of creating visually appealing tables. You can place the legend at the top or bottom of the table, with the default position being at the top.
To change the horizontal alignment of the legend's text, you can use the CSS property text-align, just like you would with regular text.
There are only two options for placing a legend with a caption: top and bottom. The top value is the default, placing the legend above the table.
Here's a summary of the options:
- top: Places the legend above the table (default)
- bottom: Places the legend below the table
Using the caption-side property gives you complete control over where the legend appears, making it easy to customize your table's layout.
Responsiveness and Layout
To make your HTML table responsive, you can add a little extra code to help it work well on smaller screens.
Adding a div element around your table and applying the style overflow-x: auto; is a simple way to make your table scroll horizontally on smaller screens.
This is especially useful for mobile devices where screen space is limited.
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