Improvements:

1. if you strip tags you should |trim to get rid of whitespace
2. trim on word boundary - see below slice() and split()
3. Use ellipsis (…) rather than "..."
4. |raw the output

{% set text = content.field_header_intro|render|striptags|trim %}

{{ (text|length > 200 ? text|slice(0, 201)|split(' ')|slice(0, -1)|join(' ') ~ '&hellip;' : text)|raw }}</code>

Improvements:

1. if you strip tags you should |trim to get rid of whitespace
2. trim on word boundary - see below slice() and split()
3. Use ellipsis (…) rather than "..."
4. |raw the output

{% set text = content.field_header_intro|render|striptags|trim %}

{{ (text|length > 200 ? text|slice(0, 201)|split(' ')|slice(0, -1)|join(' ') ~ '…' : text)|raw }}

Improvements:

1. if you strip tags you should |trim to get rid of whitespace

2. trim on word boundary

3. Use ellipsis rather than ... (|raw the output)

   {% set text = content.field_header_intro|render|striptags|trim %}

   {{ (text|length > 200 ? text|slice(0, 201)|split(' ')|slice(0, -1)|join(' ') ~ '…' : text)|raw }}

Improvements:

1. if you strip tags you should |trim to get rid of whitespace
2. trim on word boundary - see below slice() and split()
3. Use ellipsis (…) rather than "..."
4. |raw the output

{% set text = content.field_header_intro|render|striptags|trim %}

{{ (text|length > 200 ? text|slice(0, 201)|split(' ')|slice(0, -1)|join(' ') ~ '&hellip;' : text)|raw }}</code>